Which of the following is TRUE of network security?

A.
A firewall is a not a necessity in today’s connected world.

B.
A firewall is a necessity in today’s connected world.

C.
A whitewall is a necessity in today’s connected world.

D.
A black firewall is a necessity in today’s connected world.

Explanation:
Firewalls are used to restrict access to one network from another network. Most companies use firewalls to
restrict access to their networks from the Internet. Using a firewall is today mandatory.
Incorrect Answers:
A: Today, as almost all computers are interconnected through the Internet, usage of firewall is necessary.
C: Whitewall is not a concept used in the IT security domain.
D: Black firewall is not a concept used in the IT security domain.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 628