CompTIA A+ Core 1 (220-1101) — Question 62

A systems administrator has been tasked with allowing SMTP traffic through the system's host-based firewall. Which of the following ports should the administrator enable?

Answer options

• A. 23
• B. 25
• C. 80
• D. 161

Correct answer: B

Explanation

The correct answer is B, port 25, which is designated for SMTP (Simple Mail Transfer Protocol) traffic. Port 23 is used for Telnet, port 80 is for HTTP, and port 161 is for SNMP, making them unsuitable for enabling SMTP traffic.