A client's packet is received by a server with a destination port number of 69. Which service is being requested?

When a client's packet is received with a destination port number of 69, it indicates that the service being requested is the Trivial File Transfer Protocol (TFTP). TFTP is a simple protocol that facilitates the transfer of files across a network. It uses port 69 for its operations, which allows devices to send and receive files without the complexities of a more robust protocol.

Understanding port numbers is crucial in networking as they designate specific services. While other options may involve file transfer or network services, they are associated with different port numbers; for instance, the File Transfer Protocol (FTP) operates on port 21, Hypertext Transfer Protocol (HTTP) uses port 80, and Network File System (NFS) communicates over port 111 or others designated by specific configurations. This distinction is vital for routing and servicing requests correctly across networked devices.