PCCET · Question #172
What is the port for SMTP?
The correct answer is A. 25. This question asks to identify the standard port number used by the Simple Mail Transfer Protocol (SMTP).
Question
What is the port for SMTP?
Options
- A25
- B80
- C21
- D8080
How the community answered
(22 responses)- A95% (21)
- C5% (1)
Why each option
This question asks to identify the standard port number used by the Simple Mail Transfer Protocol (SMTP).
Port 25 is the standard, default port for SMTP, which is primarily used for server-to-server communication when sending email messages. While other ports exist for email submission, port 25 is dedicated to the core mail transfer function between servers.
Port 80 is the standard port for HTTP, used for unencrypted web traffic.
Port 21 is the standard port for FTP (File Transfer Protocol), used for transferring files.
Port 8080 is a commonly used alternative HTTP port or for proxy servers, not standard SMTP.
Concept tested: Standard port numbers for common protocols
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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