CompTIA A+ Core 1 (220-1001) — Question 74

A technician wants to block remote logins to a server. Which of the following ports should be blocked?

Answer options

• A. 21
• B. 53
• C. 80
• D. 443

Correct answer: B

Explanation

Blocking port 53, which is used for DNS queries, can help prevent remote logins that might exploit DNS services. The other ports, 21 (FTP), 80 (HTTP), and 443 (HTTPS), are not directly related to remote login services and do not need to be blocked for this purpose.