CERTIFIED-IN-CYBERSECURITY · Question #780
Which port number corresponds to the Simple Mail Transfer Protocol (SMTP)?
The correct answer is A. 25. SMTP uses port 25 for server-to-server email transmission. The other ports listed serve different protocols: Port 22 is used by SSH (Secure Shell) for encrypted remote access; Port 161 is used by SNMP (Simple Network Management Protocol) for network device monitoring; Port 69…
Question
Which port number corresponds to the Simple Mail Transfer Protocol (SMTP)?
Options
- A25
- B22
- C161
- D69
How the community answered
(20 responses)- A95% (19)
- D5% (1)
Explanation
SMTP uses port 25 for server-to-server email transmission. The other ports listed serve different protocols: Port 22 is used by SSH (Secure Shell) for encrypted remote access; Port 161 is used by SNMP (Simple Network Management Protocol) for network device monitoring; Port 69 is used by TFTP (Trivial File Transfer Protocol) for simple, unauthenticated file transfers. For the exam, also note that SMTP over TLS commonly uses port 587 (submission) or 465 (SMTPS), but the standard/classic SMTP port is 25.
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