DNS DOMAIN NAME SYSTEM NAME SYSTEM By Lijo George.

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Presentation transcript:

DNS DOMAIN NAME SYSTEM NAME SYSTEM By Lijo George

WHY DOES ANYONE NEED DNS ?

BROWSING WITH DNS BROWSING W/O DNS

HISTORY

HOST NAME RESOLUTION

DDNS ARCHITECTURE

FQDN

ROOT NAME SERVERS A - VeriSign Global Registry Services B - Information Sciences Institute C - Cogent Communications D - University of Maryland E - NASA Ames Research Center F - Internet Systems Consortium, Inc. G - U.S. DOD Network Information Center H - U.S. Army Research Lab I - Autonomica/NORDUnet J - VeriSign Global Registry Services K - RIPE NCC L - ICANN M - WIDE Project

TLDs

PRIVATE DOMAINS

DNS QUERY

DNS RESOLUTION PROCESS

SAMPLE RESOLUTION

CACHING

DNS RESOLVER CACHE

DNS SERVER CACHE

DNS ZONES

TTL

DNS RECORDS

ONLINE TOOLS