Pete, an employee, attempts to visit a popular social networking site but it is blocked. Instead, a page is
displayed notifying him that this site cannot be visited.
Which of the following is MOST likely blocking Pete’s access to this site?

A.
Internet content filter

B.
Firewall

C.
Proxy server

D.
Protocol analyzer

Explanation:
Web filtering software is designed to restrict or control the content a reader is authorized to access, especially
when utilized to restrict material delivered over the Internet via the Web, e-mail, or other means.
Incorrect Answers:
B: The basic purpose of a firewall is to isolate one network from another.
C: A proxy server is a variation of an application firewall or circuit-level firewall, and used as a middleman
between clients and servers. Often a proxy serves as a barrier against external threats to internal clients.
D: The terms protocol analyzer and packet sniffer are interchangeable. They refer to the tools used in the
process of monitoring the data that is transmitted across a network.

http://en.wikipedia.org/wiki/Content-control_software
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014,
pp. 11, 96, 342