CompTIA Server+ (SK0-005) — Question 151

While running a local network security scan, an administrator discovers communication between clients and one of the web servers is happening in cleartext. Company policy requires all communication to be encrypted. Which of the following ports should be closed to stop the cleartext communication?

Answer options

• A. 21
• B. 22
• C. 443
• D. 3389

Correct answer: A

Explanation

Port 21 is used for FTP, which transmits data in cleartext unless secured with FTPS or SFTP. Closing this port will prevent unencrypted communication. Ports 22 (SSH), 443 (HTTPS), and 3389 (RDP) are used for secure communications and should remain open for encrypted access.