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You are here: Home / ICND1 / Day 14 – DHCP and DNS / Day 14 Tasks / DNS Operations

DNS Operations

DNS maps hostnames to IP addresses (not the other way around). This allows you to browse a web address from your web browser instead of the server IP address.

DNS uses UDP port 53 when a host or a router wants to resolve a domain name to an IP address (or vice versa). TCP port 53 is used between two DNS servers when they want to sync or share their databases.

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