CCNA: Cisco Certified Network Associate — Question 547

What is the function of FTP?

Answer options

• A. Always operated without user connection validation
• B. Uses block number to identify and mitigate data-transfer errors
• C. Relies on the well-known UDO port 69 for data transfer
• D. Uses two separate connections for control and data traffic

Correct answer: D

Explanation

The correct answer is D because FTP operates using two channels: one for control commands and another for the actual data transfer, which is essential for its functionality. Option A is incorrect as FTP does require user authentication for secure connections. Option B is misleading since FTP does not primarily use block numbers for error detection. Option C is wrong because FTP does not use UDO port 69, which is actually associated with TFTP, not FTP.