Which port and protocol do DHCP clients use to obtain an IP address?

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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 do DHCP clients use to obtain an IP address?

Explanation:
DHCP uses UDP for its transport, and the client sends from UDP port 68 to the server’s UDP port 67 to start the address allocation process. The server replies from port 67 back to port 68, and the whole exchange—often starting with a broadcast DHCPDISCOVER—gives the client an IP address along with other network settings. Because the client’s messages originate from port 68, 68 UDP is the right description of the port the DHCP client uses to obtain an IP address. The other ports belong to different services: 67 is the server listening port, 53 is DNS, and 69 is TFTP.

DHCP uses UDP for its transport, and the client sends from UDP port 68 to the server’s UDP port 67 to start the address allocation process. The server replies from port 67 back to port 68, and the whole exchange—often starting with a broadcast DHCPDISCOVER—gives the client an IP address along with other network settings. Because the client’s messages originate from port 68, 68 UDP is the right description of the port the DHCP client uses to obtain an IP address. The other ports belong to different services: 67 is the server listening port, 53 is DNS, and 69 is TFTP.

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