Multiple choice general knowledge science & technology

What port is SMTP commonly on?

  1. 21

  2. 23

  3. 25

  4. 80
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

SMTP (Simple Mail Transfer Protocol) is the standard protocol for email transmission and traditionally uses port 25. The other ports listed are for different services: port 21 is for FTP (File Transfer Protocol), port 23 is for Telnet (remote login), and port 80 is for HTTP (web traffic).

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