Which port number is used by the DHCP client in IPv4 networks?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port number is used by the DHCP client in IPv4 networks?

Explanation:
DHCP over IPv4 uses UDP with two well-known ports: the server listens on 67 and the client uses 68. In the DHCP exchange, the client sends from source port 68 to destination port 67, and the server replies from 67 to 68. This pattern means the DHCP client’s port is 68. The other ports listed aren’t used by the client for DHCP (67 is used by the server; 19 and 9 are unrelated services).

DHCP over IPv4 uses UDP with two well-known ports: the server listens on 67 and the client uses 68. In the DHCP exchange, the client sends from source port 68 to destination port 67, and the server replies from 67 to 68. This pattern means the DHCP client’s port is 68. The other ports listed aren’t used by the client for DHCP (67 is used by the server; 19 and 9 are unrelated services).

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