Which port and protocol does DHCP servers listen on for client requests?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

Which port and protocol does DHCP servers listen on for client requests?

Explanation:
DHCP uses UDP for transport, and the server listens on UDP port 67 for client requests. Clients send from port 68 and receive replies from the server’s port 67, which is why you’ll see the flow from 68 to 67 (and back). This setup is used during the DHCP handshake when a client, often booting, broadcasts a DHCPDISCOVER to port 67; the server responds from 67 to the client’s 68 with a DHCPOFFER, and the exchange continues with 68-to-67 traffic. The other ports here belong to different services: 69 UDP is used by TFTP, and 53 UDP is used by DNS.

DHCP uses UDP for transport, and the server listens on UDP port 67 for client requests. Clients send from port 68 and receive replies from the server’s port 67, which is why you’ll see the flow from 68 to 67 (and back). This setup is used during the DHCP handshake when a client, often booting, broadcasts a DHCPDISCOVER to port 67; the server responds from 67 to the client’s 68 with a DHCPOFFER, and the exchange continues with 68-to-67 traffic. The other ports here belong to different services: 69 UDP is used by TFTP, and 53 UDP is used by DNS.

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