Computer Networks - lecture2Application Layer and DNS

com company1com computer1 how dns server caching

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Unformatted text preview: Caching Works Caching Table Host Name clientA.company1.lo cal. Where’s Client ClientA is at 192.168.8.44 A? IP Address TTL 192.168.8.44 28 seconds ClientA Client1 Client2 ClientA is at Where’s Client 192.168.8.44 A? Caching is the process of temporarily storing recently accessed information in a special memory subsystem for quicker access How DNS Data Is Stored and Maintained Namespace: training.company1.com DNS Server Resource records for the zone training.company1.com Host name DNS ClientA Zone File: Zone Training.company1.com Training.company1.com DNS ClientA DNS ClientB IP address 192.168.2.45 DNS ClientB 192.168.2.46 DNS ClientC 192.168.2.47 DNS ClientC A resource record (RR) is a standard DNS database structure containing information used to process DNS queries A zone is a portion of the DNS database that contains the resource records with the owner names that belong to the contiguous portion of the DNS namespace What Are Resource Records and Record Types? Record type Description A Resolves a host name to an IP add...
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This note was uploaded on 10/15/2011 for the course COMPUTER E EC-321 taught by Professor Liaqatali during the Spring '11 term at College of E&ME, NUST.

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