lab1 - Lab 1: L b 1 DNS Domain Name System (DNS) for...

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Lab 1: DNS omain Name System (DNS) Domain Name System (DNS) • for translating hostnames into Internet addresses • A distributed database The database is pictured as an inverted tree • Each node can be the root of a new subtree • Each of these subtrees represents a partition of the overall database – domain in DNS • Each domain can further divided into additional partitions, lled subdomains in DNS IEG7006 (2010) 1 called subdomains in DNS
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Lab1: DNS An example of ie.cuhk.edu.hk domain hk u ov et rg edu gov net com org cuhk hk uu s t cse ee ie se acae IEG7006 (2010) 2
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Lab1: DNS Common Top-Level Domains com • Commercial organizations, such as Hewlett-Packard ( hp.com ), Sun Microsystems ( sun.com ), and IBM ( ibm.com ) edu ducational organizations such as U C Berkeley ( erkeley edu Educational organizations, such as U.C. Berkeley ( berkeley.edu ) and Purdue University ( purdue.edu ) gov • Government organizations, such as NASA ( nasa.gov ) and the National Science Foundation ( nsf.gov ) IEG7006 (2010) 3
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Lab1: DNS b: N S Common Top-Level Domains mil ilitary organizations, such as the U.S. Army ( rmy.mil and Military organizations, such as the U.S. Army ( army.mil ) and Navy ( navy.mil ) net etworking organizations such as NSFNET ( sf net Networking organizations, such as NSFNET ( nsf.net ) org • Noncommercial organizations, such as the Electronic Frontier Foundation ( eff.org ) ee more Top evel Domains at See more Top-Level Domains at http://www.norid.no/domenenavnbaser/domreg.html IEG7006 (2010) 4
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op Level Root Servers Top Level Root Servers Root Server Operated by A.ROOT-SERVERS.NET VeriSign Naming and Directory Services B.ROOT-SERVERS.NET Information Sciences Institute C.ROOT-SERVERS.NET Cogent Communications D.ROOT-SERVERS.NET University of Maryland E.ROOT-SERVERS.NET NASA Ames Research Center F.ROOT-SERVERS.NET Internet Systems Consortium, Inc G.ROOT-SERVERS.NET U.S. DOD Network - Information Center H.ROOT-SERVERS.NET U.S. Army Research Lab I.ROOT-SERVERS.NET Autonomica J.ROOT-SERVERS.NET VeriSign, Inc.
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This note was uploaded on 05/18/2010 for the course INFORMATIO IEG7006 taught by Professor Unknown during the Spring '10 term at CUHK.

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lab1 - Lab 1: L b 1 DNS Domain Name System (DNS) for...

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