CPSA Port Numbers with Services and Protocols Practice Test 2026 - Free CPSA Practice Questions and Study Guide

DHCP runs over UDP, and the server listens for client requests on UDP port 67. In the typical exchange, the client sends from source port 68 to destination port 67, and the server replies from source port 67 to destination port 68. Because DHCP uses UDP, there’s no formal connection setup like TCP. The other ports/protocols don’t fit DHCP: 67 TCP would imply TCP, which DHCP doesn’t use; 63 TCP isn’t used; and 68 UDP is the client’s source port, not the server’s listening port.