CompTIA Security+ Question K-22

While securing a network it is decided to allow active FTP connections into the network. Which of the following ports MUST be configured to allow active FTP connections? (Select TWO).

A. 20
B. 21
C. 22
D. 68
E. 69

Answer: A,B

Explanation:
FTP (File Transfer Protocol) makes use of ports 20 and 21