Which protocol listens on both TCP and UDP port 53 and provides recursive and iterative queries that resolve hostnames into IP addresses on IP networks?
DNS
SNMP
LDAP
DHCP
Domain Name System (DNS) servers answer recursive and iterative queries to translate fully qualified domain names (FQDNs) such as www.example.com into the numerical IP addresses computers use. DNS uses both UDP (most lookups) and TCP (zone transfers or responses that exceed UDP size) on port 53.
DHCP (ports 67/68) automatically leases IP addresses but does not perform hostname lookups. LDAP (port 389) is a directory access protocol. SNMP (ports 161/162) is used for network monitoring and management.
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