Domain Name System. DNS DEFINITION The “Domain Name System” Created in 1983 by Paul Mockapetris (RFCs 1034 and 1035), modified, updated, and enhanced.

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Presentation transcript:

Domain Name System

DNS DEFINITION The “Domain Name System” Created in 1983 by Paul Mockapetris (RFCs 1034 and 1035), modified, updated, and enhanced by many of subsequent RFCs The Internet users use DNS to reference anything by name on the Internet The mechanism by which Internet software translates names to addresses and vice versa

DOMAIN NAMES A domain name is the sequence of labels from a node to the root, separated by dots (“.”s), read left to right Example domain names:  yemen.net.ye  Yahoo.com

&SUBDOMAIN NAME one domain is a sub-Domain of another if its domain name ends in the other’s domain name  So yemen.net.ye is a subdomain of  net.ye  ye  google.com is a subdomain of com.

DNS NAMING STRUCTURE Top level domains TLDs defined by global authority  com, org,  edu. ccTLD : country code TLDs.  ye 2 nd Level Domains.  net.ye  google.com

TOP-LEVEL DOMAINS (TLDS)

COUNTRY CODE DOMAINS Top level domains are US-centric. Geographic TLDs used for organizations in other countries: TLD Country.uk United Kingdom.fr France.ye Yemen Countries define their own internal hierarchy: gov.ye, org.ye,net.ye, edu.ye and com.ye are used for organizations in Yemen

SECOND-LEVEL DOMAINS Within every top-level domain there is a huge list of 2 nd level domains For example, in the COM second-level domain, you've got:  yahoo  msn  microsoft  plus millions of others...

DNS naming structure Example TLD ccTLD 2 nd LD3 rd LD 2 nd LD Examples : Google.com yemen.net.ye