CompTIA Network+ (N10-007) — Question 511

Which of the following default ports should be opened on a firewall to allow for SSH and Telnet? (Choose two.)

Answer options

• A. 21
• B. 22
• C. 23
• D. 25
• E. 123
• F. 443

Correct answer: B, C

Explanation

SSH operates on port 22, while Telnet uses port 23. The other options, such as 21 (FTP), 25 (SMTP), 123 (NTP), and 443 (HTTPS), are not used for SSH or Telnet and thus do not need to be opened for these services.