Which protocol uses port 25?

Prepare for the ITS Certiport Networking Test. Study with interactive quizzes and detailed explanations. Enhance your understanding and excel in your exam!

Multiple Choice

Which protocol uses port 25?

Explanation:
Port numbers identify services on a host, and SMTP is the protocol used to deliver email between mail servers (and often for client submission as well). The standard destination port for SMTP is 25, which is why this protocol is associated with that port. FTP, by contrast, uses port 21 (and 20 for data in some modes); HTTPS uses port 443 for secure web traffic; and TCP is the transport layer that carries many protocols (including SMTP) rather than a single protocol tied to one port. So port 25 corresponds to SMTP.

Port numbers identify services on a host, and SMTP is the protocol used to deliver email between mail servers (and often for client submission as well). The standard destination port for SMTP is 25, which is why this protocol is associated with that port. FTP, by contrast, uses port 21 (and 20 for data in some modes); HTTPS uses port 443 for secure web traffic; and TCP is the transport layer that carries many protocols (including SMTP) rather than a single protocol tied to one port. So port 25 corresponds to SMTP.

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