A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?

The client is requesting SSH (Secure Shell) service. In networking, port numbers are used to distinguish different services or processes. Port 22 is the default port for SSH, which is a protocol used for secure logins, file transfers, and other secure network services over an unsecured network.

Here’s a brief overview of the other services mentioned and their typical port numbers:

• DNS (Domain Name System): Usually uses port 53. It translates domain names into IP addresses.
• DHCP (Dynamic Host Configuration Protocol): Typically uses port 67 for the DHCP server and port 68 for the DHCP client. It is used for automatically assigning IP addresses and other network configuration parameters.
• TFTP (Trivial File Transfer Protocol): Generally uses port 69. It’s a simple file transfer protocol, with less functionality compared to FTP.