CompTIA A+ Core 1 (220-1201) — Question 18

Which of the following port numbers is used for a file transfer?

Answer options

• A. 21
• B. 53
• C. 68
• D. 389

Correct answer: A

Explanation

Port 21 is used for FTP (File Transfer Protocol), which is specifically designed for transferring files over the network. The other options represent different services: port 53 is for DNS, port 68 is for DHCP client communication, and port 389 is used for LDAP.