Jam

Kamis, 14 Februari 2013

Ms. Access



Ms. Access

1. Sebuah data yang ditampilkan dalam bentuk laporan disebut …

a. Forms

b. Query

c. Table

d. Records

e. Report

2. Fasilitas yang digunakan untuk mempermudah proses pemasukan data, pencarian data, pengeditan data dan lainnya disebut …

a. Forms

b. Query

c. Table

d. Records

e. Report

3. Cara membuat baris data baru yang masih kosong dari Ms. Access adalah memilih …

a. Blank data base

b. Blank data access page

c. Project using new data

d. Project using exiting data

e. From axiting file

4. Berikut ini ciri yang berada dalam field primay cary …

a. Harus bertipe tab

b. Boleh ada data yang sama

c. Boleh diisi belakangan

d. Tidak boleh ada data yang sama

e. Salah semua

5. Untuk mengunci data seperti NIS dengan menggunakan …

a. Kunci

b. Primay key

c. Query

d. Record

e. Report

6. Bagian-bagian dari database adalah sebagai berikut, kecuali …

a. Form

b. Format

c. Tabel

d. Query

e. Report

7. Yang digunakan untuk menerangkan field name adalah …

a. Description

b. Field size

c. Input mask

d. Format

e. Captain

8. Untuk menambah record baru dipilih …

a. Insert record

b. Insert row

c. Insert data

d. Update record

e. Update data

9. Extenil file untuk program database Ms. Access adalah ...

a. MDB

b. TXT

c. PPT

d. MYD

e. DOC

10. Untuk menghapus field tertentu yang dipilih adalah …

a. Delete – row

b. Delete – coloum

c. Delete – record

d. Delete – field

e. Delete – table




Internet

11. WWW singkatan dari …

a. Word wide web

b. Wide word web

c. Word web wide

d. Wide word web

e. Wide web word

12. Kumpulan komputer yang terhubung satu dengan yang lain dalam sebuah jaringan disebut …

a. Chatting

b. Provider

c. Bluetooth

d. Internet

e. Browsing

13. Berdasarkan skala jaringan-jaringan komputer dibagi menjadi beberapa macam, kecuali …

a. WIFI

b. FTP

c. WAN

d. MAN

e. LAN

14. IRC adalah fasilitas internet yang digunakan untuk …

a. Kirim pesan

b. Upload file

c. Chatting / percakapan

d. Mencari informasi / situs

e. Download

15. Internet dibentuk oleh department pertahanan Amerika Serikat pada tahun …

a. 1954

b. 1973

c. 1969

d. 1985

e. 1988

16. Mendaftar E-mail ke penyedia pelayanan gratis sering disebut …

a. login

b. Sign up

c. Attachment

d. Account

e. Freedom

17. Setiap dokumen hypertext / hypermedia di internet memiliki alamat yang unik dan berbeda antara satu dengan lainnya yang disebut …

a. www

b. html

c. http

d. URL

e. homepage

18. Untuk masuk dan membaca pesan E-mail langkah pertama yang kita lakukan adalah …

a. Sign in

b. Sign out

c. Log in

d. Sign up

e. Account


19. Surat yang digunakan untuk mengirim pesan lewat internet disebut …

a. Facebook

b. E-mail

c. E-card

d. E-library

e. Chatting

20. Berikut ini yang merupakan sifat-sifat E-mail, kecuali …

a. Sarana komunikasi yang murah

b. Dapat dikirim dengan cepat

c. Dapat mengirim surat sebanyak mungkin

d. Dapat melampirkan file-file

e. Panjang surat yang dikirim dibatasi




Jaringan

21. Jaringan komputer yang mencakup area sangat luas dari segi geografis adalah …

a. LAN

b. RAM

c. WAN

d. MAN

e. Internet

22. Jaringan yang terdapat dalam sebuah gedung atau perkantoran adalah …

a. MAN

b. Internet

c. RAM

d. LAN

e. WAN

23. Kekurangan menggunakan modem …

a. Pemasangan mudah

b. Harga murah

c. Harga mahal

d. Pemasangan sulit

e. Tidak memakan ram

24. Di bawah ini yang tidak termasuk salah satu ISP adalah …

a. PDAM

b. Google

c. PLN

d. Telkom

e. Internet

25. Kepanjangan dari LAN …

a. Legal Area Network

b. Local Area Network

c. Login Area Network

d. Linear Area Network

e. Log up Area Network

26. Topologi yang bentuknya seperti bintang adalah …

a. Token ring

b. Star

c. Peer to peer

d. MAN

e. Bus

27. Salah satu keuntungan menggunakan topologi Bus adalah …

a. Layout kabel rumit

b. Menggunakan repeater

c. Hemat kabel

d. Peer to peer

e. Lalu lintas data cepat

28. Dalam suatu jaringan komputer yang bertindak sebagai administrator atau pengelola jaringan disebut …

a. Laptop

b. Client

c. Notebook

d. Server

e. ISP

29. Diantara topologi berikut yang pengembangan jaringannya paling fleksibel, adalah …

a. RJ-45

b. Bus

c. Star

d. Token ring

e. Peer to peer

30. Kepanjangan dari MAN adalah …

a. Maintenance Area Network

b. Metropolitan Area Network

c. Micro Area Network

d. Micropolitan Area Network

e. Microsoft Area Network




KUNCI JAWABAN




MS. ACCESS

1. E 6. B

2. A 7. C

3. B 8. A

4. D 9. B

5. B 10. D




INTERNET

11. A 16. D

12. D 17. D

13. A 18. A

14. E 19. B

15. C 20. E




JARINGAN

21. C 26. B

22. A 27. C

23. D 28. D

24. B 29. C

25. B 30. B

Sumber: http://id.shvoong.com/internet-and-technologies/software/2334760-contoh-soal-test-ujian-tulis/#ixzz2KvqkBFmd

Kamis, 07 Februari 2013

Mengoperasikan Software Presentasi (Power Point)



Pilihan ganda soal dan jawaban uas tik kelas xii 40 butir. 5 uraian soal dan jawaban uas tik kelas xii.


Berilah tanda silang (X) pada huruf a, b, c, d atau e di depan jawaban yang benar!


1. Jenis komunikasi visual adalah ….

a. komunikasi yang mengandalkan penciuman

b. komunikasi yang mengandalkan alat pengecap

c. komunikasi yang mengandalkan alat pendengaran

d. komunikasi yang mengandalkan alat penglihatan

e. komunikasi dua arah


2. Berikut merupakan prinsip dasar dari sebuah desain grafis yaitu ….

a. preposisi

b. chaos

c. komposisi

d. integrasi

e. intuisi


3. Di bawah ini merupakan program-program desain grafis, yaitu ….

a. SPSS

b. Outlook Express

c. Mozilla Firefox

d. Photoshop

e. Mathlab


4. Berikut ini adalah desain grafis yang berbasis vektor, yaitu ….

a. CorelPHOTO-PAINT

b. CorelDRAW
c. Photoshop

d. Microsoft Excel

e. Notepad


5. Ciri utama dari grafis berbasis vektor adalah ….

a. tidak resolution dependent

b. resolution dependent

c. bertumpu pada pixel

d. bertumpu pada dot

e. pecah jika diperbesar


6. Berikut ini adalah hasil dari desain grafis dengan menggunakan Corel DRAW adalah ….

a. logo sekolah

b. Banner

c. edit foto

d. rancang bangunan

e. Grafik


7.





Gambar tersebut menunjukkan perintah ….

a. membuka lembar kerja baru

b. membuka dokumen grafis yang telah disimpan pada folder

c. membuka file dari template

d. menyimpan dokumen hasil kerja

e. Mengubah nama file


8.




Gambar di atas menunjukkan ….

a. ikon

b. Title bar

c. Menu bar

d. Task bar

e. Tool bar


9.




Tampilan di atas ini menunjukkan ….

a. jumlah gambar yang telah di simpan dalam folder

b. jumlah ikon yang terdapat pada property bar

c. jumlah media penyimpanan pada folder

d. jumlah lembar kerja pada satu file

e. jumlah file dalam suatu objek


10.




Ikon di samping menunjukkan perintah untuk ….

a. memperbesar tampilan objek

b. memotong objek

c. menyimpan hasil kerja

d. membuka file

e. menghapus objek


11.




Ikon tersebut menunjukkan perintah untuk ….

a. menyimpan file

b. mencetak lembar kerja

c. melihat desain sebelum dicetak pada tampilan monitor

d. mengirimkan file ke format lainnya

e. membuka file dalam dokumen


12.




Ikon tersebut menunjukkan perintah untuk ….

a. membuat objek elips

b. membuat objek kotak

c. membuat objek spiral

d. membuat objek Polygon

e. membuat objek nerupa teks


13.




Ikon tersebut menunjukkan perintah untuk ….

a. Blending

b. Contour

c. Envelope

d. Extrude

e. Texture


14. Objek bintang dapat dibentuk dengan menggunakan ikon ….

a. Rectangle Tool

b. Ellipse Tool

c. Polygon Tool

d. Bezier Tool

e. Text Tool


15.





Ikon tersebut menunjukkan perintah untuk ….

a. memberikan warna tunggal pada objek

b. memberikan warna gradasi pada objek

c. memberikan warna texture pada objek

d. memberikan warna pattern pada objek

e. memberikan warna contour


16. Membuat objek bintang segi banyak dapat dibuat dengan menggunakan ….

a. Basic Shape

b. Rectanguler

c. Polygon

d. Spiral

e. Ellipse


17.




Tampilan tersebut menunjukkan ….

a. posisi orientasi kertas

b. ukuran panjang kertas

c. ukuran lebar kertas

d. menyimpan hasil kerja

e. posisi pada saat mencetak


18. Memunculkan garis-garis grid pada tampilan CorelDRAW dapat dilakukan dengan ….

a. pilih menu File > Grid

b. pilih menu View > Grid

c. pilih menu Text > Grid

d. pilih menu File > Open

e. pilih menu Text > Line


19. Mengisikan teks pada lembar kerja CorelDRAW, pertama kali harus mengklik ikon ….

a. Rectangle Tool

b. Bezier Tool

c. Text Tool

d. Ellipse Tool

e. Spiral Tool


20.




Objek tersebut dapat dibentuk dengan menggunakan ….

a. Bezier Tool

b. Ellipse Tool

c. Rectangle Tool

d. Polygon Tool

e. Spiral Tool


21.




Ikon disamping menunjukkan perintah ….

a. menunjukkan lebar sebuah objek

b. memutar objek dengan angka tertentu

c. menebalkan garis luar pada objek

d. menyimpan objek pada folder tertentu

e. membalikan objek


22.




Objek tesebut dibuat dengan menggunakan ….

a. Bezier Tool

b. Shape Tool

c. Preset Tool

d. Brush Tool

e. Blending Tool


23.





Efek yang digunakan untuk membuat objek di atas adalah ….

a. Contour

b. Blending

c. Envelope

d. Weld

e. Texture


24.





Ikon di samping menunjukkan informasi ….

a. jumlah efek blending pada objek

b. jumlah banyaknya efek kontur pada objek

c. derajat kemiringan pada objek

d. jumlah warna pada objek

e. bayangan pada objek


25.





Ikon tersebut akan menimbulkan efek … pada objek

a. lensa

b. shadow

c. kontur

d. envelope

e. Texture


26.





Efek yang digunakan untuk membuat objek di atas adalah ….

a. Envelope

b. Kontur

c. Lens

d. Shadow

e. Texture


27. Menggabungkan dua buah objek menjadi satu objek, dapat dilakukan dengan menggunakan efek ….

a. Trim

b. Weld

c. Intersect

d. Group

e. Union


28. Untuk memperoleh objek sisa dari hasil potongan antara dua objek dapat dilakukan dengan ….

a. efek Trim

b. efek Weld

c. efek Intersect

d. efek Envelope

e. efek Outer glow


29. Hal yang dilakukan untuk memulai program CorelDRAW adalah ….

a. klik Start

b. klik Program

c. klik Open

d. klik Close

e. klik New


30. Fasilitas untuk mendapatkan informasi tentang fungsi ikon adalah ….

a. New Graphic

b. Corel Tutorial

c. CorelDRAW Installation

d. What’s New

e. Page Setup


31. Perintah untuk memperbaiki kualitas isian pada sebuah objek adalah ….

a. menu Tool > Options > Preview Fountain Steps

b. Format > Color Palette

c. Text > Fit Text to Path

d. File > Save As

e. Format > Out line


32.





Gambar di atas merupakan gambar untuk menuliskan ….

a. nama Jenis file

b. folder tempat penyimpanan file

c. penamaan file

d. jenis huruf

e. ukuran Font


33.





Nama flyout pada gambar di atas adalah ….

a. Elipse Tool

b. Rectangle Tool

c. Bezier Tool

d. Spiral Tool

e. Octagon Tool


34. Cara cepat yang dapat dilakukan untuk melakukan penggandaan sebuah objek adalah ….

a. pilih copy objek kemudian pilih paste objek

b. pilih Ctrl+C kemudian pilih Ctrl+V

c. tekan secara bersama-sama Ctrl+D

d. tekan secara bersama-sama Alt+D

e. tekan secara bersama-sama Ctrl+V


35. Perintah yang dapat dilakukan untuk membuat salinan objek agar posisi penempatannya tepat secara matematis adalah ….

a. Arrange > Transformation > Position

b. Arrange > Transformation > Convert to Curve

c. Arrange > Transformation > Save As

d. Arrange > Transformation > Skew

e. Arrange > Transformation > Save


36.





Tampilan di atas ini adalah flyout untuk ….

a. memberikan warna tunggal pada objek

b. memberikan warna Pattern pada objek

c. memberikan warna Texture pada objek

d. memberikan warna Gradasi pada objek

e. memberikan bayangan pada objek


37. Untuk membuat efek salinan di antara dua objek, gunakan efek ….

a. Kontur

b. Blend

c. Lensa

d. Transparency

e. Outer Glow


38.





Flyout di atas adalah ikon untuk membuat efek ….

a. kontur

b. lensa

c. bayangan

d. transparan

e. 3D


39.





Gambar di atas adalah property bar yang menunjukkan ….

a. identitas ukuran dari sebuah objek

b. tampilan property bar yang menunjukkan arah dari sebuah objek

c. jumlah banyaknya objek pada dua objek yang diberi efek Blend

d. tidak aktifnya efek blend pada objek

e. ukuran font


40.





Flyout di atas dapat memberikan efek … pada objek

a. Blending

b. Envelope

c. Transparent

d. Kontur

e. 3D






Kunci Jawaban

1. d 9. d 17. a 25. b

3. d 11. b 19. c 27. d

5. a 13. b 21. b

7. b 15. c 23. a

29. a 33. b 30. b 34. c

31. a 35. a 32. c 36. c

37. b 38. d 39. c 20. d




http://budisma.web.id/materi/sma/tik-kelas-xii/soal-dan-jawaban-uas-tik-kelas-xii/

Soal Jawaban UAS TIK XI Semester Genap


Soal Jawaban UAS TIK XI Semester Genap
Pilihan ganda Soal Jawaban UAS TIK XI Genap 2012 40 butir. 5 uraian Soal Jawaban UAS TIK XI Genap 2012
A. Pilihlah jawaban yang benar.
1. Program pengolah angka dikenal juga dengan nama ….
a. Word Processor
b. Browser
c. Spreadsheet
d. Image Editor
e. Database
2. Nama file kerja yang sedang Anda gunakan (aktif) akan tampak pada … Microsoft Excel.
a. Title Bar
c. Ribbon
d. Office Button
e. Status Bar
3. Menu berikut yang tidak terdapat pada Office Button adalah ….
a. New d. Copy
b. Open e. Print
c. Save
4. Halaman yang berisi tombol-tombol untuk pengeditan dokumen terdapat pada ribbon ….
a. Home
b. Insert
c. Page Layout
d. Formula
e. Data
5. Tombol pengurutan terdapat pada ribbon ….
a. Home
b. Insert
c. Page Layout
d. Formula
e. Data
6. Bagian yang berisi tombol-tombol sebagai jalan pintas untuk memanggil perintahperintah tertentu disebut ….
a. Scrollbar
b. Title Bar
c. Quick Access Toolbar
d. Ribbon
e. Office Button
7Shortcut keys yang digunakan untuk membuat workbook baru adalah ….
a. Alt + F4
b. Ctrl + N
c. Ctrl + C
d. Alt + C
e. Ctrl + X
8. Kumpulan beberapa sel disebut ….
b. Range
c. Column
d. Row
e. Formula Bar
9. Untuk membingkai sel atau sekelompok sel maka digunakan tombol ….
a. Autoshape
b. Rectangel
c. Fill
d. Border
e. Graphic
10. Memberi warna latar pada sel dapat dilakukan menggunakan tombol ….
a. Fill
b. Border
c. Format
d. Chart
e. Insert
11. Berikut yang tidak terdapat pada menu dropdown Insert adalah ….
a. Insert Cell
b. Insert Sheet Row
c. Insert Sheet Column
d. Insert Sheet
e. Insert File
12. Penulisan formula pada sel selalu diawali dengan ….
a. =
b. *
c. for
d. +
e. –
13. Ikon cutcopy, dan paste terdapat pada menu ….
a. Home
b. Insert
c. Data
d. Formula
e. View
14. Formula yang digunakan untuk menjumlahkan sekelompok nilai adalah ….
a. ADD
b. MIN
c. MAX
d. AVERAGE
e. SUM
15. Nilai terbesar dari suatu kelompok data dapat dicari menggunakan fungsi ….
a. MIN
b. MAX
c. IF
d. AVERAGE
e. SUM
16. Fungsi berikut yang tidak termasuk kelompok fungsi manipulasi string adalah ….
a. LEFT
b. MID
c. RIGHT
d. DOWN
e. semua benar
17. Fungsi IF dalam MS Excel adalah fungsi jenis ….
a. trigonometri
b. manipulasi string
c. statistik
d. logika
e. manipulasi data
18. Agar tabel hanya menampilkan data-data sesuai kriteria yang dimasukkan, harus dilakukan ….
a. editing
b. deleting
c. filtering
d. tabulasi
e. penyisipan
19. Sebelum mulai mencetak sebuah dokumen sebaiknya Anda memeriksanya dengan ….
a. Page Setup
b. Quick Print
c. Print Preview
d. Publish
e. Print Range
20. Untuk mengatur tata letak cetakan, menu yang dipilih adalah ….
a. Print Range
b. Page Setup
c. Quick Print
d. Print Preview
e. Publish
21. Formula = MAX () pada program Excel digunakan untuk ….
a. mencari nilai terkecil dari sekelompok data
b. menghitung rata-rata dari sekelompok nilai
c. mencari nilai terbesar dari sekelompok data
d. menjumlahkan sekelompok nilai
e. mencari angka dari sekelompok data
22. Untuk melakukan penjumlahan data pada Excel digunakan formula .…
a. AVERAGE
b. MIN
c. MAX
d. SUM
e. IF
23. Berikut penulisan formula penjumlahan yang benar adalah .…
a. = sum (B2 – B7)
b. = sum (B3 – B8)
c. = sum (C2 * D2)
d. = sum (B4 : C4)
e. = sum (B2 = B7)
24. Fungsi Look up adalah untuk ….
a. mencocokkan teks dengan daftar IF
b. mencocokkan teks dengan tabel referensi
c. mencocokkan teks dengan pernyataan
d. mencocokkan teks dengan sintak
e. mencocokkan teks dengan keadaan
25. Untuk menghasilkan ONE dari tulisan INDONESIA, digunakan perintah ….
a. = RIGHT (“INDONESIA”, 4,3)
b. = MID (“INDONESIA”, 1,3)
c. = MID (“INDONESIA”, 3,3)
d. = LEFT (“INDONESIA”, 3,3)
e. = MID (“INDONESIA”, 4,3)
26. Perintah yang digunakan untuk membuat grafik adalah ….
a. Format Object
b. Edit Chart
c. Insert Chart
d. Format Chart
e. Insert Object
27. Jika pada suatu sel terdapat pernyataan “#VALUE!”, yang harus Anda lakukan adalah ….
a. menghapus isi sel
b. mengklik undo
c. memeriksa nilai pada sel
d. mengklik redo
e. menyisipkan sel baru
28. Pengurutan data dilakukan dengan cara mengklik sel yang akan diurutkan kemudian padaRibbon diklik pada grup ….
a. Sort and filter
b. Cell styles
c. Format
d. Insert
e. Find and Select
29. Untuk menyisipkan objek gambar ke dalam dokumen, tab pada Ribbon yang harus diklik adalah ….
a. Data
b. Home
c. Insert
d. Formulas
e. Review
30. Berikut ini penulisan formula menghitung rata-rata yang benar adalah ….
a. = SUM (B4 + C4)
b. = AVERAGE (B4 : C4)
c. = AVERAGE (B4 : G8)
d. = MAX (B2 + C2)
e. = MIN (B4 + C4)
31. Untuk menyisipkan simbol “±” saat membuat suatu dokumen, langkah yang harus dilakukan adalah dengan mengklik ….
a. Insert Text Box > ±
b. Review Spelling
c. Insert Symbol – ±
d. Page Layout Print titles
e. Formulas Insert Function
32. Agar tampilan pada dokumen menjadi menarik dapat disisipkan gambar yang telah disediakan oleh Microsoft Office, yaitu ….
a. Template
b. Wallpaper
c. Background
d. Shapes
e. Clip Art
33. Untuk mengganti ukuran kertas yang akan diprint, pada kotak dialog Page Setup dipilih tab….
a. Page
b. Margins
c. Header/Footer
d. Sheet
e. Border
34. Sebelum memulai pencetakan, dokumen sebaiknya diperiksa terlebih dahulu dengan ….
a. Page Setup
b. Quick Print
c. Print Preview
d. Publish
e. Print Range
35. Untuk mengatur tata letak cetakan, menu yang dipilih ….
a. Print Range
b. Page Setup
c. Quick Print
d. Print Preview
e. Publish
36. Untuk memberi bingkai pada sel, menu yang harus dipilih pada kotak dialog Format Cellsadalah ….
a. Number
b. Alignment
c. Borders
d. Font
e. Fill
37. Menu yang harus dipilih untuk memperlebar atau mempersempit ukuran kolom padaworksheet adalah ….
a. Insert Sheet Column
b. Insert Sheet
c. Borders
d. Row Height
e. Column Widht
38. Untuk menembah garis dalam Excel, perintah yang diklik pada menu Insert adalah ….
a. Insert Cells
b. Insert Sheet Rows
c. Insert Sheet Column
d. Insert Sheet
e. Insert Name
39. Berikut merupakan tombol yang digunakan dalam memformat teks agar menjadi miring, yaitu ….
a. Ctrl+B
b. Ctrl+I
c. Ctrl+U
d. Ctrl+S
e. Ctrl+O
40. Pengertian dari range adalah ….
a. pertemuan antara worksheet
b. pertemuan antara workbook
c. kumpulan sel sembarang
d. kumpulan sel berbentuk persegi panjang
e. pertemuan antara garis dan kolom

B. Uraian
1. Jelaskan perbedaan antara sel absolut dan sel relatif?
2. Jelaskan definisi dari baris dan kolom yang terdapat dalam lembar kerja Excel!
3. Sebutkan beberapa shortcut yang ada di Microsoft Excel beserta fungsinya!
4. Jelaskan langkah untuk melebarkan kolom dalam Microsoft Excel 2007!
5. Sebutkan beberapa hal yang harus diperhatikan apabila kita memasukkan data ke dalam suatu sel!

Kunci Jawaban
A. Pilihlah Ganda
1. c 11. e
2. a 12. a
3. d 13. a
4. a 14. e
5. a 15. b
6. c 16. d
7. b 17. d
8. b 18. c
9. d 19. c
10. a 20. b
21. c 26. e 31. c 36. c
22. d 27. c 32. e37. eljkhup
23. d 28. a 33. a38. b
24. b 29. c 34. c39. b
25. c 30. b 35. b40. d
B.Uraian
  1. Sel absolute adalah sel yang terkunci pada kedua bagian, yaitu kolom dan baris sel relative/sel bebas/normal, yaitu sel yang tidak terkunci pada bagian baris maupun kolomnya.
  2. Baris adalah bagian dari lemar kerja excel yang membujur disimbolkan dengan huruf A,B,C,D dan sterusnya, sedangkan kolom adalah bagian dari excel yang disimbolkan dengan angka.
  3. Icon menu control, Shorcut print, save As, Save, Open, Send, Pubhlish, Prepared
  4. Klik tab menu home > cell > pilih Format akan muncul cell size > pilih ukuran column width.
  5. Memperhatikan jenis datanya, menggunakan operator yang sesuai.


Senin, 21 Januari 2013


Domain Name System

From Wikipedia, the free encyclopedia
The Domain Name System (DNS) is a [hierarchical] distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translatesdomain names meaningful for users to the numerical IP addresses needed for the purpose of locating computer services and devices worldwide. By providing a worldwide, distributed keyword-based redirection service, the Domain Name System is an essential component of the functionality of theInternet.
An often-used analogy to explain the Domain Name System is that it serves as the phone book for the Internet by translating human-friendly computerhostnames into IP addresses. For example, the domain name www.example.com translates to the addresses 192.0.43.10 (IPv4) and 2620:0:2d0:200::10 (IPv6). Unlike a phone book, the DNS can be quickly updated, allowing a service's location on the network to change without affecting the end users, who continue to use the same host name. Users take advantage of this when they recite meaningful Uniform Resource Locators (URLs) and e-mail addresses without having to know how the computer actually locates the services.
The Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designatingauthoritative name servers for each domain. Authoritative name servers are assigned to be responsible for their particular domains, and in turn can assign other authoritative name servers for their sub-domains. This mechanism has made the DNS distributed and fault tolerant and has helped avoid the need for a single central register to be continually consulted and updated. Additionally, the responsibility for maintaining and updating the master record for the domains is spread among many domain name registrars, who compete for the end-user's, domain-owner's, business. Domains can be moved from registrar to registrar at any time.
The Domain Name System also specifies the technical functionality of this database service. It defines the DNS protocol, a detailed specification of the data structures and communication exchanges used in DNS, as part of the Internet Protocol Suite.
The Internet maintains two principal namespaces, the domain name hierarchy[1] and the Internet Protocol (IP) address spaces.[2] The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces. Internet name servers and a communication protocol implement the Domain Name System.[3] A DNS name server is a server that stores the DNS records for a domain name, such as address (A) records, name server (NS) records, and mail exchanger (MX) records (see also list of DNS record types); a DNS name server responds with answers to queries against its database.

Contents

  [hide

[edit]History

The practice of using a name as a simpler, more memorable abstraction of a host's numerical address on a network dates back to the ARPANET era. Before the DNS was invented in 1982, each computer on the network retrieved a file called HOSTS.TXT from a computer at SRI (now SRI International).[4][5] The HOSTS.TXT file mapped names to numerical addresses. A hosts file still exists on most modern operating systems by default and generally contains a mapping of "localhost" to the IP address 127.0.0.1. Many operating systems use name resolution logic that allows the administrator to configure selection priorities for available name resolution methods.
The rapid growth of the network made a centrally maintained, hand-crafted HOSTS.TXT file unsustainable; it became necessary to implement a more scalable system capable of automatically disseminating the requisite information.
At the request of Jon PostelPaul Mockapetris invented the Domain Name System in 1983 and wrote the first implementation. The original specifications were published by the Internet Engineering Task Force in RFC 882 and RFC 883, which were superseded in November 1987 by RFC 1034[1] and RFC 1035.[3] Several additional Request for Comments have proposed various extensions to the core DNS protocols.
In 1984, four Berkeley students—Douglas Terry, Mark Painter, David Riggle, and Songnian Zhou—wrote the first Unix implementation, called The Berkeley Internet Name Domain (BIND) Server.[6]In 1985, Kevin Dunlap of DEC significantly re-wrote the DNS implementation. Mike Karels, Phil Almquist, and Paul Vixie have maintained BIND since then. BIND was ported to the Windows NTplatform in the early 1990s.
BIND was widely distributed, especially on Unix systems, and is the dominant DNS software in use on the Internet.[7] With the heavy use and resulting scrutiny of its open-source code, as well as increasingly more sophisticated attack methods, many security flaws were discovered in BIND[citation needed]. This contributed to the development of a number of alternative name server and resolver programs. BIND version 9 was written from scratch and now has a security record comparable to other modern DNS software.[citation needed]

[edit]Structure

[edit]Domain name space

The domain name space consists of a tree of domain names. Each node or leaf in the tree has zero or more resource records, which hold information associated with the domain name. The tree sub-divides into zones beginning at the root zone. A DNS zone may consist of only one domain, or may consist of many domains and sub-domains, depending on the administrative authority delegated to the manager.
The hierarchical Domain Name System, organized into zones, each served by a name server
Administrative responsibility over any zone may be divided by creating additional zones. Authority is said to be delegatedfor a portion of the old space, usually in the form of sub-domains, to another nameserver and administrative entity. The old zone ceases to be authoritative for the new zone.

[edit]Domain name syntax

The definitive descriptions of the rules for forming domain names appear in RFC 1035RFC 1123, and RFC 2181. A domain name consists of one or more parts, technically called labels, that are conventionally concatenated, and delimited by dots, such as example.com.
  • The right-most label conveys the top-level domain; for example, the domain name www.example.com belongs to the top-level domain com.
  • The hierarchy of domains descends from right to left; each label to the left specifies a subdivision, or subdomain of the domain to the right. For example: the label example specifies a subdomain of the com domain, and www is a sub domain of example.com. This tree of subdivisions may have up to 127 levels.
  • Each label may contain up to 63 characters. The full domain name may not exceed a total length of 253 characters in its external dotted-label specification.[8] In the internal binary representation of the DNS the maximum length requires 255 octets of storage.[1] In practice, some domain registries may have shorter limits.[citation needed]
  • DNS names may technically consist of any character representable in an octet. However, the allowed formulation of domain names in the DNS root zone, and most other sub domains, uses a preferred format and character set. The characters allowed in a label are a subset of the ASCII character set, and includes the characters a through zAthrough Z, digits 0 through 9, and the hyphen. This rule is known as the LDH rule (letters, digits, hyphen). Domain names are interpreted in case-independent manner.[9] Labels may not start or end with a hyphen.[10]
  • hostname is a domain name that has at least one IP address associated. For example, the domain names www.example.com and example.com are also hostnames, whereas the comdomain is not.

[edit]Internationalized domain names

The permitted character set of the DNS prevented the representation of names and words of many languages in their native alphabets or scripts. ICANN has approved the Internationalizing Domain Names in Applications (IDNA) system, which maps Unicode strings into the valid DNS character set using Punycode. In 2009 ICANN approved the installation of IDN country code top-level domains. In addition, many registries of the existing top level domain names (TLD)s have adopted IDNA.

[edit]Name servers

The Domain Name System is maintained by a distributed database system, which uses the client-server model. The nodes of this database are the name servers. Each domain has at least one authoritative DNS server that publishes information about that domain and the name servers of any domains subordinate to it. The top of the hierarchy is served by the root nameservers, the servers to query when looking up (resolving) a TLD.

[edit]Authoritative name server

An authoritative name server is a name server that gives answers that have been configured by an original source, for example, the domain administrator or by dynamic DNS methods, in contrast to answers that were obtained via a regular DNS query to another name server. An authoritative-only name server only returns answers to queries about domain names that have been specifically configured by the administrator.
An authoritative name server can either be a master server or a slave server. A master server is a server that stores the original (master) copies of all zone records. A slave server uses an automatic updating mechanism of the DNS protocol in communication with its master to maintain an identical copy of the master records.
A set of authoritative name servers has to be assigned for every DNS zone. NS record about addresses of that set must be stored in parent zone and servers themselves (as self-reference).
When domain names are registered with a domain name registrar, their installation at the domain registry of a top level domain requires the assignment of a primary name server and at least onesecondary name server. The requirement of multiple name servers aims to make the domain still functional even if one name server becomes inaccessible or inoperable.[11] The designation of a primary name server is solely determined by the priority given to the domain name registrar. For this purpose, generally only the fully qualified domain name of the name server is required, unless the servers are contained in the registered domain, in which case the corresponding IP address is needed as well.
Primary name servers are often master name servers, while secondary name server may be implemented as slave servers.
An authoritative server indicates its status of supplying definitive answers, deemed authoritative, by setting a software flag (a protocol structure bit), called the Authoritative Answer (AA) bit in its responses.[3] This flag is usually reproduced prominently in the output of DNS administration query tools (such as dig) to indicate that the responding name server is an authority for the domain name in question.[3]

[edit]Operation

[edit]Address resolution mechanism

Domain name resolvers determine the appropriate domain name servers responsible for the domain name in question by a sequence of queries starting with the right-most (top-level) domain label.
A DNS recursor consults three nameservers to resolve the address www.wikipedia.org.
The process entails:
  1. A network host is configured with an initial cache (so called hints) of the known addresses of the root nameservers. Such a hint file is updated periodically by an administrator from a reliable source.
  2. A query to one of the root servers to find the server authoritative for the top-level domain.
  3. A query to the obtained TLD server for the address of a DNS server authoritative for the second-level domain.
  4. Repetition of the previous step to process each domain name label in sequence, until the final step which returns the IP address of the host sought.
The diagram illustrates this process for the host www.wikipedia.org.
The mechanism in this simple form would place a large operating burden on the root servers, with every search for an address starting by querying one of them. Being as critical as they are to the overall function of the system, such heavy use would create an insurmountable bottleneck for trillions of queries placed every day. In practice caching is used in DNS servers to overcome this problem, and as a result, root nameservers actually are involved with very little of the total traffic.

[edit]Recursive and caching name server

In principle, authoritative name servers are sufficient for the operation of the Internet. However, with only authoritative name servers operating, every DNS query must start with recursive queries at the root zone of the Domain Name System and each user system must implement resolver software capable of recursive operation.
To improve efficiency, reduce DNS traffic across the Internet, and increase performance in end-user applications, the Domain Name System supports DNS cache servers which store DNS query results for a period of time determined in the configuration (time-to-live) of the domain name record in question. Typically, such caching DNS servers, also called DNS caches, also implement the recursive algorithm necessary to resolve a given name starting with the DNS root through to the authoritative name servers of the queried domain. With this function implemented in the name server, user applications gain efficiency in design and operation.
The combination of DNS caching and recursive functions in a name server is not mandatory; the functions can be implemented independently in servers for special purposes.
Internet service providers typically provide recursive and caching name servers for their customers. In addition, many home networking routers implement DNS caches and recursors to improve efficiency in the local network.

[edit]DNS resolvers

The client-side of the DNS is called a DNS resolver. It is responsible for initiating and sequencing the queries that ultimately lead to a full resolution (translation) of the resource sought, e.g., translation of a domain name into an IP address.
A DNS query may be either a non-recursive query or a recursive query:
  • non-recursive query is one in which the DNS server provides a record for a domain for which it is authoritative itself, or it provides a partial result without querying other servers.
  • recursive query is one for which the DNS server will fully answer the query (or give an error) by querying other name servers as needed. DNS servers are not required to support recursive queries.
The resolver, or another DNS server acting recursively on behalf of the resolver, negotiates use of recursive service using bits in the query headers.
Resolving usually entails iterating through several name servers to find the needed information. However, some resolvers function more simply by communicating only with a single name server. These simple resolvers (called "stub resolvers") rely on a recursive name server to perform the work of finding information for them.

[edit]Circular dependencies and glue records

Name servers in delegations are identified by name, rather than by IP address. This means that a resolving name server must issue another DNS request to find out the IP address of the server to which it has been referred. If the name given in the delegation is a subdomain of the domain for which the delegation is being provided, there is a circular dependency. In this case the nameserver providing the delegation must also provide one or more IP addresses for the authoritative nameserver mentioned in the delegation. This information is called glue. The delegating name server provides this glue in the form of records in the additional section of the DNS response, and provides the delegation in the answer section of the response.
For example, if the authoritative name server for example.org is ns1.example.org, a computer trying to resolve www.example.org first resolves ns1.example.org. Since ns1 is contained in example.org, this requires resolving example.org first, which presents a circular dependency. To break the dependency, the nameserver for the org top level domain includes glue along with the delegation for example.org. The glue records are address records that provide IP addresses for ns1.example.org. The resolver uses one or more of these IP addresses to query one of the domain's authoritative servers, which allows it to complete the DNS query.

[edit]Record caching

The DNS Resolution Process reduces the load on individual servers by caching DNS request records for a period of time after a response. This entails the local recording and subsequent consultation of the copy instead of initiating a new request upstream. The time for which a resolver caches a DNS response is determined by a value called the time to live (TTL) associated with every record. The TTL is set by the administrator of the DNS server handing out the authoritative response. The period of validity may vary from just seconds to days or even weeks.
As a noteworthy consequence of this distributed and caching architecture, changes to DNS records do not propagate throughout the network immediately, but require all caches to expire and refresh after the TTL. RFC 1912 conveys basic rules for determining appropriate TTL values.
Some resolvers may override TTL values, as the protocol supports caching for up to 68 years or no caching at all. Negative caching, i.e. the caching of the fact of non-existence of a record, is determined by name servers authoritative for a zone which must include the Start of Authority (SOA) record when reporting no data of the requested type exists. The value of the MINIMUM field of the SOA record and the TTL of the SOA itself is used to establish the TTL for the negative answer.

[edit]Reverse lookup

A reverse lookup is a query of the DNS for domain names when the IP address is known. Multiple domain names may be associated with an IP address. The DNS stores IP addresses in the form of domain names as specially formatted names in pointer (PTR) records within the infrastructure top-level domain arpa. For IPv4, the domain is in-addr.arpa. For IPv6, the reverse lookup domain is ip6.arpa. The IP address is represented as a name in reverse-ordered octet representation for IPv4, and reverse-ordered nibble representation for IPv6.
When performing a reverse lookup, the DNS client converts the address into these formats, and then queries the name for a PTR record following the delegation chain as for any DNS query. For example, assume the IPv4 address 208.80.152.2 is assigned to Wikimedia. It is represented as a DNS name in reverse order like this: 2.152.80.208.in-addr.arpa. When the DNS resolver gets a PTR (reverse-lookup) request, it begins by querying the root servers (which point to The American Registry For Internet Numbers' (ARIN's) servers for the 208.in-addr.arpazone). On ARIN's servers, 152.80.208.in-addr.arpa is assigned to Wikimedia, so the resolver sends another query to the Wikimedia nameserver for 2.152.80.208.in-addr.arpa, which results in an authoritative response.

[edit]Client lookup

DNS resolution sequence
Users generally do not communicate directly with a DNS resolver. Instead DNS resolution takes place transparently in applications such as web browserse-mail clients, and other Internet applications. When an application makes a request that requires a domain name lookup, such programs send a resolution request to the DNS resolver in the local operating system, which in turn handles the communications required.
The DNS resolver will almost invariably have a cache (see above) containing recent lookups. If the cache can provide the answer to the request, the resolver will return the value in the cache to the program that made the request. If the cache does not contain the answer, the resolver will send the request to one or more designated DNS servers. In the case of most home users, the Internet service provider to which the machine connects will usually supply this DNS server: such a user will either have configured that server's address manually or allowed DHCP to set it; however, where systems administrators have configured systems to use their own DNS servers, their DNS resolvers point to separately maintained nameservers of the organization. In any event, the name server thus queried will follow the process outlinedabove, until it either successfully finds a result or does not. It then returns its results to the DNS resolver; assuming it has found a result, the resolver duly caches that result for future use, and hands the result back to the software which initiated the request.

[edit]Broken resolvers

An additional level of complexity emerges when resolvers violate the rules of the DNS protocol. A number of large ISPs have configured their DNS servers to violate rules (presumably to allow them to run on less-expensive hardware than a fully compliant resolver), such as by disobeying TTLs, or by indicating that a domain name does not exist just because one of its name servers does not respond.[12]
As a final level of complexity, some applications (such as web-browsers) also have their own DNS cache, in order to reduce the use of the DNS resolver library itself. This practice can add extra difficulty when debugging DNS issues, as it obscures the freshness of data, and/or what data comes from which cache. These caches typically use very short caching times—on the order of one minute.[13]
Internet Explorer represents a notable exception: versions up to IE 3.x cache DNS records for 24 hours by default. Internet Explorer 4.x and later versions (up to IE 8) decrease the default time out value to half an hour, which may be changed in corresponding registry keys.[14]

[edit]Other applications

The system outlined above provides a somewhat simplified scenario. The Domain Name System includes several other functions:
  • Hostnames and IP addresses do not necessarily match on a one-to-one basis. Multiple hostnames may correspond to a single IP address: combined with virtual hosting, this allows a single machine to serve many web sites. Alternatively, a single hostname may correspond to many IP addresses: this can facilitate fault tolerance and load distribution, and also allows a site to move physical locations seamlessly.
  • There are many uses of DNS besides translating names to IP addresses. For instance, Mail transfer agents use DNS to find out where to deliver e-mail for a particular address. The domain to mail exchanger mapping provided by MX records accommodates another layer of fault tolerance and load distribution on top of the name to IP address mapping.
  • E-mail Blacklists: The DNS is used for efficient storage and distribution of IP addresses of blacklisted e-mail hosts. The usual method is putting the IP address of the subject host into the sub-domain of a higher level domain name, and resolve that name to different records to indicate a positive or a negative. Here is a hypothetical example blacklist:
    • 102.3.4.5 is blacklisted => Creates 5.4.3.102.blacklist.example and resolves to 127.0.0.1
    • 102.3.4.6 is not => 6.4.3.102.blacklist.example is not found, or default to 127.0.0.2
    • E-mail servers can then query blacklist.example through the DNS mechanism to find out if a specific host connecting to them is in the blacklist. Today many of such blacklists, either free or subscription-based, are available mainly for use by email administrators and anti-spam software.
  • Sender Policy Framework and DomainKeys, instead of creating their own record types, were designed to take advantage of another DNS record type, the TXT record.
  • To provide resilience in the event of computer failure, multiple DNS servers are usually provided for coverage of each domain, and at the top level, thirteen very powerful root servers exist, with additional "copies" of several of them distributed worldwide via Anycast.
  • Dynamic DNS (sometimes called DDNS) allows clients to update their DNS entry as their IP address changes, as it does, for example, when moving between ISPs or mobile hot spots.

[edit]Protocol details

DNS primarily uses User Datagram Protocol (UDP) on port number 53 to serve requests.[3] DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. The Transmission Control Protocol (TCP) is used when the response data size exceeds 512 bytes, or for tasks such as zone transfers. Some resolver implementations use TCP for all queries.

[edit]DNS resource records

A Resource Record (RR) is the basic data element in the domain name system. Each record has a type (A, MX, etc.), an expiration time limit, a class, and some type-specific data. Resource records of the same type define a resource record set (RRset). The order of resource records in a set, returned by a resolver to an application, is undefined, but often servers implement round-robin ordering to achieve Global Server Load BalancingDNSSEC, however, works on complete resource record sets in a canonical order.
When sent over an IP network, all records use the common format specified in RFC 1035:[15]
RR (Resource record) fields
FieldDescriptionLength (octets)
NAMEName of the node to which this record pertains(variable)
TYPEType of RR in numeric form (e.g. 15 for MX RRs)2
CLASSClass code2
TTLCount of seconds that the RR stays valid (The maximum is 231-1, which is about 68 years.)4
RDLENGTHLength of RDATA field2
RDATAAdditional RR-specific data(variable)
NAME is the fully qualified domain name of the node in the tree. On the wire, the name may be shortened using label compression where ends of domain names mentioned earlier in the packet can be substituted for the end of the current domain name. A free standing @ is used to denote the current origin.
TYPE is the record type. It indicates the format of the data and it gives a hint of its intended use. For example, the A record is used to translate from a domain name to an IPv4 address, the NSrecord lists which name servers can answer lookups on a DNS zone, and the MX record specifies the mail server used to handle mail for a domain specified in an e-mail address (see also List of DNS record types).
RDATA is data of type-specific relevance, such as the IP address for address records, or the priority and hostname for MX records. Well known record types may use label compression in the RDATA field, but "unknown" record types must not (RFC 3597).
The CLASS of a record is set to IN (for Internet) for common DNS records involving Internet hostnames, servers, or IP addresses. In addition, the classes Chaos (CH) and Hesiod (HS) exist.[16]Each class is an independent name space with potentially different delegations of DNS zones.
In addition to resource records defined in a zone file, the domain name system also defines several request types that are used only in communication with other DNS nodes (on the wire), such as when performing zone transfers (AXFR/IXFR) or for EDNS (OPT).

[edit]Wildcard DNS records

The domain name system supports wildcard domain names which are names that start with the asterisk label, '*', e.g., *.example.[1][17] DNS records belonging to wildcard domain names specify rules for generating resource records within a single DNS zone by substituting whole labels with matching components of the query name, including any specified descendants. For example, in the DNS zone x.example, the following configuration specifies that all subdomains (including subdomains of subdomains) of x.example use the mail exchanger a.x.example. The records for a.x.example are needed to specify the mail exchanger. As this has the result of excluding this domain name and its subdomains from the wildcard matches, all subdomains ofa.x.example must be defined in a separate wildcard statement.
The role of wildcard records was refined in RFC 4592, because the original definition in RFC 1034 was incomplete and resulted in misinterpretations by implementers.[17]

[edit]Protocol extensions

The original DNS protocol had limited provisions for extension with new features. In 1999, Paul Vixie published in RFC 2671 an extension mechanism, called Extension mechanisms for DNS(EDNS) that introduced optional protocol elements without increasing overhead when not in use. This was accomplished through the OPT pseudo-resource record that only exists in wire transmissions of the protocol, but not in any zone files. Initial extensions were also suggested (EDNS0), such as increasing the DNS message size in UDP datagrams.

[edit]Dynamic zone updates

Dynamic DNS updates use the UPDATE DNS opcode to add or remove resource records dynamically from a zone data base maintained on an authoritative DNS server. The feature is described inRFC 2136. This facility is useful to register network clients into the DNS when they boot or become otherwise available on the network. Since a booting client may be assigned a different IP address each time from a DHCP server, it is not possible to provide static DNS assignments for such clients.

[edit]Security issues

Originally, security concerns were not major design considerations for DNS software or any software for deployment on the early Internet, as the network was not open for participation by the general public. However, the expansion of the Internet into the commercial sector in the 1990s changed the requirements for security measures to protect data integrity and user authentication.
Several vulnerability issues were discovered and exploited by malicious users. One such issue is DNS cache poisoning, in which data is distributed to caching resolvers under the pretense of being an authoritative origin server, thereby polluting the data store with potentially false information and long expiration times (time-to-live). Subsequently, legitimate application requests may be redirected to network hosts operated with malicious intent.
DNS responses are traditionally not cryptographically signed, leading to many attack possibilities; the Domain Name System Security Extensions (DNSSEC) modify DNS to add support for cryptographically signed responses. Several extensions have been devised to secure zone transfers as well.
Some domain names may be used to achieve spoofing effects. For example, paypal.com and paypa1.com are different names, yet users may be unable to distinguish them in a graphical user interface depending on the user's chosen typeface. In many fonts the letter l and the numeral 1 look very similar or even identical. This problem is acute in systems that support internationalized domain names, since many character codes in ISO 10646, may appear identical on typical computer screens. This vulnerability is occasionally exploited in phishing.[18]
Techniques such as forward-confirmed reverse DNS can also be used to help validate DNS results.

[edit]Domain name registration

The right to use a domain name is delegated by domain name registrars which are accredited by the Internet Corporation for Assigned Names and Numbers (ICANN), the organization charged with overseeing the name and number systems of the Internet. In addition to ICANN, each top-level domain (TLD) is maintained and serviced technically by an administrative organization, operating a registry. A registry is responsible for maintaining the database of names registered within the TLD it administers. The registry receives registration information from each domain name registrar authorized to assign names in the corresponding TLD and publishes the information using a special service, the whois protocol.
ICANN publishes the complete list of TLD registries and domain name registrars. Registrant information associated with domain names is maintained in an online database accessible with theWHOIS service. For most of the more than 240 country code top-level domains (ccTLDs), the domain registries maintain the WHOIS (Registrant, name servers, expiration dates, etc.) information. For instance, DENIC, Germany NIC, holds the DE domain data. Since about 2001, most gTLD registries have adopted this so-called thick registry approach, i.e. keeping the WHOIS data in central registries instead of registrar databases.
For COM and NET domain names, a thin registry model is used: the domain registry (e.g. VeriSign) holds basic WHOIS (registrar and name servers, etc.) data. One can find the detailed WHOIS(registrant, name servers, expiry dates, etc.) at the registrars.
Some domain name registries, often called network information centers (NIC), also function as registrars to end-users. The major generic top-level domain registries, such as for the COMNET,ORGINFO domains, use a registry-registrar model consisting of many domain name registrars.[19][20] In this method of management, the registry only manages the domain name database and the relationship with the registrars. The registrants (users of a domain name) are customers of the registrar, in some cases through additional layers of resellers.

[edit]Internet standards

The Domain Name System is defined by Request for Comments (RFC) documents published by the Internet Engineering Task Force (Internet standards). The following is a list of RFCs that define the DNS protocol.
  • RFC 920Domain Requirements – Specified original top-level domains
  • RFC 1032Domain Administrators Guide
  • RFC 1033Domain Administrators Operations Guide
  • RFC 1034Domain Names - Concepts and Facilities
  • RFC 1035Domain Names - Implementation and Specification
  • RFC 1101DNS Encodings of Network Names and Other Types
  • RFC 1123Requirements for Internet Hosts—Application and Support
  • RFC 1178Choosing a Name for Your Computer (FYI 5)
  • RFC 1183New DNS RR Definitions
  • RFC 1591Domain Name System Structure and Delegation (Informational)
  • RFC 1912Common DNS Operational and Configuration Errors
  • RFC 1995Incremental Zone Transfer in DNS
  • RFC 1996A Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY)
  • RFC 2100The Naming of Hosts (Informational)
  • RFC 2136Dynamic Updates in the domain name system (DNS UPDATE)
  • RFC 2181Clarifications to the DNS Specification
  • RFC 2182Selection and Operation of Secondary DNS Servers
  • RFC 2308Negative Caching of DNS Queries (DNS NCACHE)
  • RFC 2317Classless IN-ADDR.ARPA delegation (BCP 20)
  • RFC 2671Extension Mechanisms for DNS (EDNS0)
  • RFC 2672Non-Terminal DNS Name Redirection
  • RFC 2845Secret Key Transaction Authentication for DNS (TSIG)
  • RFC 3225Indicating Resolver Support of DNSSEC
  • RFC 3226DNSSEC and IPv6 A6 aware server/resolver message size requirements
  • RFC 3597Handling of Unknown DNS Resource Record (RR) Types
  • RFC 3696Application Techniques for Checking and Transformation of Names (Informational)
  • RFC 4343Domain Name System (DNS) Case Insensitivity Clarification
  • RFC 4592The Role of Wildcards in the Domain Name System
  • RFC 4635HMAC SHA TSIG Algorithm Identifiers
  • RFC 4892Requirements for a Mechanism Identifying a Name Server Instance (Informational)
  • RFC 5001DNS Name Server Identifier (NSID) Option
  • RFC 5452Measures for Making DNS More Resilient against Forged Answers
  • RFC 5625DNS Proxy Implementation Guidelines (BCP 152)
  • RFC 5890Internationalized Domain Names for Applications (IDNA):Definitions and Document Framework
  • RFC 5891Internationalized Domain Names in Applications (IDNA): Protocol
  • RFC 5892The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)
  • RFC 5893Right-to-Left Scripts for Internationalized Domain Names for Applications (IDNA)
  • RFC 5894Internationalized Domain Names for Applications (IDNA):Background, Explanation, and Rationale (Informational)
  • RFC 5895Mapping Characters for Internationalized Domain Names in Applications (IDNA) 2008 (Informational)
  • RFC 5966DNS Transport over TCP - Implementation Requirements
  • RFC 6195Domain Name System (DNS) IANA Considerations (BCP 42)

[edit]Security

  • RFC 4033DNS Security Introduction and Requirements
  • RFC 4034Resource Records for the DNS Security Extensions
  • RFC 4035Protocol Modifications for the DNS Security Extensions
  • RFC 4509Use of SHA-256 in DNSSEC Delegation Signer (DS) Resource Records
  • RFC 4470Minimally Covering NSEC Records and DNSSEC On-line Signing
  • RFC 5011Automated Updates of DNS Security (DNSSEC) Trust Anchors
  • RFC 5155DNS Security (DNSSEC) Hashed Authenticated Denial of Existence
  • RFC 5702Use of SHA-2 Algorithms with RSA in DNSKEY and RRSIG Resource Records for DNSSEC
  • RFC 5910Domain Name System (DNS) Security Extensions Mapping for the Extensible Provisioning Protocol (EPP)
  • RFC 5933Use of GOST Signature Algorithms in DNSKEY and RRSIG Resource Records for DNSSEC

[edit]See also

[edit]References

  1. a b c d RFC 1034Domain Names - Concepts and Facilities, P. Mockapetris, The Internet Society (November 1987)
  2. ^ RFC 781Internet Protocol - DARPA Internet Program Protocol Specification, Information Sciences Institute, J. Postel (Ed.), The Internet Society (September 1981)
  3. a b c d e RFC 1035Domain Names - Implementation and Specification, P. Mockapetris, The Internet Society (November 1987)
  4. ^ RFC 3467Role of the Domain Name System (DNS), J.C. Klensin, J. Klensin (February 2003)
  5. ^ Cricket Liu, Paul Albitz (2006). DNS and BIND (5th ed.). O'Reilly. p. 3.
  6. ^ Douglas Brian Terry, Mark Painter, David W. Riggle and Songnian Zhou, The Berkeley Internet Name Domain Server, Proceedings USENIX Summer Conference, Salt Lake City, Utah, June 1984, pages 23–31.
  7. ^ "DNS Server Survey".
  8. ^ RFC 2181Clarifications to the DNS Specification, R. Elz, R. Bush (July 1997)
  9. ^ Network Working Group of the IETF, January 2006, RFC 4343: Domain Name System (DNS) Case Insensitivity Clarification
  10. ^ RFC 3696Application Techniques for Checking and Transformation of Names, J.C. Klensin, J. Klensin
  11. ^ "Name Server definition at techterms.com".
  12. ^ "Providers ignoring DNS TTL?"Slashdot. 2005. Retrieved 2012-04-07.
  13. ^ Ben Anderson: Why Web Browser DNS Caching Can Be A Bad Thing
  14. ^ "How Internet Explorer uses the cache for DNS host entries"Microsoft Corporation. 2004. Retrieved 2010-07-25.
  15. ^ RFC 5395Domain Name System (DNS) IANA Considerations, D. Eastlake 3rd (November 2008), Section 3
  16. ^ RFC 5395Domain Name System (DNS) IANA Considerations, D. Eastlake 3rd (November 2008), p. 11
  17. a b RFC 4592The Role of Wildcards in the Domain Name System, E. Lewis (July 2006)
  18. ^ APWG. "Global Phishing Survey: Domain Name Use and Trends in 1H2010." 10/15/2010 apwg.org
  19. ^ ICANN accredited registrars[dead link]
  20. ^ VeriSign COM and NET registry

[edit]External links

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