Advanced Computer Networks

Table of Contents

DNS

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DNS

resolves hostnames to IP addresses.

DNS query:

query local DNS server
if not found, go to root nameserver
root says to contact TLD nameserver (e.g. “com”)
TLD nameserver says to contact domain nameserver
domain nameserver gives IP address

DNS types:

resolution: AAAA (IPv6), A (IPv4)
nameserver: NS
alias (canonical hostname): CNAME
mail server: MX