The Chief Information Security Officer (CISO) has mandated that all IT systems with credit card
data be segregated from the main corporate network to prevent unauthorized access and that
access to the IT systems should be logged. Which of the following would BEST meet the CISO’s
requirements?

A.
Sniffers

B.
NIDS

C.
Firewalls

D.
Web proxies

E.
Layer 2 switches

Explanation:
The basic purpose of a firewall is to isolate one network from another.