CompTIA Network+ (N10-008) — Question 767

A network administrator is configuring a firewall to allow for a new cloud-based email server. The company standard is to use SMTP to route email traffic. Which of the following ports, by default, should be reserved for this purpose?

Answer options

• A. 23
• B. 25
• C. 53
• D. 110

Correct answer: B

Explanation

Port 25 is the default port used for SMTP, which is the protocol utilized for sending emails. Port 23 is used for Telnet, port 53 is for DNS, and port 110 is for POP3 email retrieval, making them inappropriate for the SMTP configuration.