Which of the following is an advantage of proxies?

A.
Proxies provide a single point of access, control, and logging.

B.
Proxies must exist for each service.

C.
Proxies create a single point of failure.

D.
Proxies do not protect the base operating system.

Explanation:
Proxies provide services through a single access point. Proxies can be installed in order to eavesdrop upon the
data-flow between client machines and the web. All content sent or accessed – including passwords submitted
and cookies used – can be captured and analyzed by the proxy operator.
Incorrect Answers:
B: A proxy can handle many services, not only a single service. A client connects to the proxy server,
requesting some service, such as a file, connection, web page, or other resource available from a different
server and the proxy server evaluates the request as a way to simplify and control its complexity.
C: Proxies does not create a single point of failure.
D: Firewall proxies protect the base operating system.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 653