DNS (Domain Name System) is the service that provides a directory lookup for IP addresses and host names. DNS translates human-readable domain names (like www.example.com ) into IP addresses that computers use to identify each other on the network.
DNS: Converts domain names into IP addresses and vice versa.
DHCP: Dynamically assigns IP addresses to devices on a network.
SNMP: Used for network management and monitoring.
NAT: Translates private IP addresses to a public IP address for accessing the internet.
References:
Cisco DNS Documentation
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