Which of the following is the primary security feature of a proxy server?

A.
Virus Detection

B.
URL blocking

C.
Route blocking

D.
Content filtering

Explanation:
A proxy firewall is a network security system that protects network resources by filtering messages at the
application layer. The application-level proxy understands the packet as a whole and can make access
decisions based on the content of the packets.
Incorrect Answers:
A: Firewalls does not detect viruses.
B: A proxy server firewall does not use URL blocking.
C: A proxy server firewall does not use route blocking.
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 636