11-DNS - CSE 265: System & Network Administration DNS The...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison CSE 265: CSE 265: DNS – The Domain Name System History of DNS What does DNS do? The DNS namespace BIND software How DNS works DNS database Testing and debugging (tools)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison DNS History DNS History In original ARPANET, a single text file listed all machines Updates used significant portion of available bandwidth File was still constantly out of date DNS solves scalability problem Hierarchical host naming Distributed responsibility Caching of content } Major ideas!
Background image of page 2
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison What does DNS do? What does DNS do? Provides hostname – IP lookup services www.lehigh.edu = 128.180.2.57 DNS defines A hierarchical namespace for hosts and IP addresses A distributed database of hostname and address info A “resolver” -- library routines that query this database Improved routing for email A mechanism for finding services on a network A protocol for exchanging naming information DNS is essential for any org using the Internet
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison
Background image of page 4
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison What uses DNS? What uses DNS? Any application that operates over the Internet Such as email Spam filters WWW FTP IRC, IM Windows update telnet, ssh
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison The DNS namespace The DNS namespace A tree of “domains” Root is “.” (dot), followed by top-level (root-level) domains Two branches of tree One maps hostnames to IP addresses Other maps IP address back to hostnames Two types of top-level domain names used today gTLDs: generic top-level domains ccTLDs: country code top-level domains Some illustrations from O'Reilly's DNS & Bind
Background image of page 6
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison Generic top-level domains Generic top-level domains See http://www.iana.org/gtld/gtld.htm Domain Purpose Domain Purpose com Companies Air transport industry Educational institutions Businesses gov (US) government agencies coop Cooperatives mil (US) military agencies info Unrestricted net Network providers jobs Human resources folks Nonprofit organizations museum Museums int International organizations name Individuals IP address lookup pro Professionals (attorneys, etc.) aero edu boz org arpa
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison Common country codes Common country codes See http://www.iana.org/cctld/cctld-whois.htm Code Country Code Country au Australia hu Hungary br Brazil
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2008 for the course CSE 265 taught by Professor Davison during the Spring '08 term at Lehigh University .

Page1 / 35

11-DNS - CSE 265: System & Network Administration DNS The...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online