CCNA: Cisco Certified Network Associate — Question 1327

Which protocol should be used to transfer large files on a company intranet that allows TCP 20 and 21 through the firewall?

Answer options

• A. SMTP
• B. REST API
• C. TFTP
• D. FTP

Correct answer: D

Explanation

The correct answer is FTP, which uses TCP ports 20 and 21 for file transfers. SMTP is used for email transmission, REST API is a web service interface, and TFTP, while also used for file transfers, does not utilize the same ports as FTP and is less reliable.