Last Updated on November 15, 2023 by InfraExam
A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?
|Explanation & Hint:
The client is requesting the FTP (File Transfer Protocol) service. In networking, port numbers are used to distinguish between different services that run over the network. Port 21 is the standard port number for FTP control messages. FTP is used for the transfer of computer files between a client and server on a computer network.
Here’s what the other port numbers are typically used for: