CCNA: Cisco Certified Network Associate — Question 1028

Which is a fact related to FTP?

Answer options

• A. It uses two separate connections for control and data traffic.
• B. It uses block numbers to identify and mitigate data-transfer errors.
• C. It always operates without user authentication.
• D. It relies on the well-known UDP port 69.

Correct answer: A

Explanation

The correct answer is A because FTP indeed uses two separate connections: one for control commands and another for transferring data. Option B is incorrect as FTP does not use block numbers for error management; it relies on TCP. Option C is false because FTP can require user authentication. Option D is wrong since FTP uses TCP, typically on port 21, not UDP port 69.