Multiple choice networking

What is the default port of a SMTP server?

  1. 8

  2. 21

  3. 80

  4. 25

  5. 110

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

SMTP (Simple Mail Transfer Protocol) uses TCP port 25 by default for server-to-server communication. Port 80 is for HTTP, 21 is for FTP, 110 is for POP3, and 443 is for HTTPS.