What port is used by the DHCP server to listen for client requests?

The port used by the DHCP server to listen for client requests is 67. Dynamic Host Configuration Protocol (DHCP) operates in a client-server model where clients send requests for IP address configuration information, and the server responds to these requests.

When a client device wants to communicate its need for configuration information, it broadcasts a DHCP Discover message on the network. This message is sent to the server on the well-known port 67. The server, which listens on this port, receives the request and replies with a DHCP Offer message.

The other ports listed do not pertain to the DHCP server’s operation. Port 68 is used by DHCP clients to receive messages from the server, port 69 is used for the Trivial File Transfer Protocol (TFTP), and port 53 is utilized for the Domain Name System (DNS). Thus, these ports serve different purposes within networking and are not related to the function of DHCP in the same manner as port 67.