Cisco Certified DevNet Associate (200-901 DEVASC) Practice Test

A DHCP server listens for client requests on UDP port 67. This port is specifically designated for DHCP server communications, allowing the server to handle client requests for IP address configuration and other network settings. When a client device connects to a network and seeks to obtain an IP address, it sends a DHCP Discover message to the broadcast address on this port. The server responds with an offer using the same UDP port, which facilitates the necessary exchange of information to assign the client an IP address and other relevant configurations.

The other options represent different services: UDP port 68 is used by DHCP clients to receive responses from servers but does not apply to the server-side listening. UDP port 53 is used for DNS services, while UDP port 22 is associated with SSH, which is unrelated to DHCP processes. Understanding these port assignments is crucial for grasping how DHCP operates in network environments.