CompTIA A+ Core 1 (220-1101) — Question 1

Which of the following utilizes TCP ports 20/21 and transfers data in cleartext?

Answer options

• A. SNMP
• B. SSH
• C. FTP
• D. Telnet

Correct answer: C

Explanation

FTP (File Transfer Protocol) operates over TCP ports 20 and 21 and does not encrypt its data, making it a cleartext protocol. In contrast, SNMP (Simple Network Management Protocol) and SSH (Secure Shell) both provide security features, with SSH encrypting data, and Telnet also transmits data in cleartext but does not use the specified ports.