N10-005 Question #640: Real Exam Question with Answer & Explanation

The correct answer is D: 25. SMTP (Simple Mail Transfer Protocol) traditionally uses port 25 for mail server-to-server communication. Port 25 is heavily exploited by spammers because many ISPs leave it open. Administrators often move outbound client mail submission to port 587 (the official SMTP submission p

Question

In order to reduce spam email, Kim, a network administrator, changes the standard SMTP port from which of the following port numbers to port number 587?

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Explanation

SMTP (Simple Mail Transfer Protocol) traditionally uses port 25 for mail server-to-server communication. Port 25 is heavily exploited by spammers because many ISPs leave it open. Administrators often move outbound client mail submission to port 587 (the official SMTP submission port), which requires authentication, making it much harder for spammers to abuse. Port 20 is FTP data, port 21 is FTP control, and port 23 is Telnet.

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