CCNA: Cisco Certified Network Associate — Question 485

How does TFTP operate in a network?

Answer options

• A. Provides secure data transfer
• B. Relies on the well-known TCP port 20 to transmit data
• C. Uses block numbers to identify and mitigate data-transfer errors
• D. Requires two separate connections for control and data traffic

Correct answer: C

Explanation

The correct answer is C because TFTP uses block numbers to keep track of data packets and to detect any errors during transfer. Options A and B are incorrect because TFTP does not provide secure data transfer and does not use TCP port 20; it operates over UDP. Option D is also incorrect as TFTP uses a single connection for both control and data traffic.