CompTIA Security Plus Mock Test Q144

Which of the following ports would be blocked if Pete, a security administrator, wants to deny access to websites?

A. 21
B. 25
C. 80
D. 3389

Correct Answer: C
Section: Network Security

Explanation:
Port 80 is used by HTTP, which is the foundation of data communication for the World Wide Web.

Incorrect Answers:
A: FTP uses TCP port 21.
B: SMTP uses TCP port 25.
D: Remote Desktop Protocol (RDP) uses TCP port 3389.

References:
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 51, 52