A client packet is received by a server with a destination port number of 67. What service is the client requesting?

When a client packet reaches a server with a destination port number of 67, the service being requested is the Dynamic Host Configuration Protocol (DHCP).

DHCP utilizes port 67 for the server side of communication. Specifically, when a client device operates on a network requiring an IP address configuration, it sends a broadcast request to find a DHCP server. The server, listening on port 67 for incoming DHCP client requests, responds to the client with the necessary configuration details, such as an IP address, subnet mask, default gateway, and other network parameters.

The other services listed in the options operate on different port numbers: DNS (Domain Name System) operates on port 53, HTTP (Hypertext Transfer Protocol) runs on port 80, and FTP (File Transfer Protocol) typically uses port 21 for command control. Therefore, the presence of a destination port number of 67 clearly indicates that the client is utilizing DHCP to request configuration settings from the server.