A SMTP server listens on a well-known TCP port ____ for an incoming request.
A) 21
B) 25
C) 110
D) 115

Name: A SMTP server listens on a well-known TCP port ____ for an incoming request. A) 21 B) 25 C) 110 D) 115
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The Simple Mail Transfer Protocol (SMTP) runs on port 25, which is the well-known port assigned by the Internet Assigned Numbers Authority (IANA) for this service. Port 21 is used for FTP, port 110 is used for POP3, and port 115 is not a registered well-known port.

A SMTP Server Listens on a Well-Known TCP Port ____