What would you call a network security control deployed in line to detects, alerts, and takes action when a
possible intrusion is detected.

A.
Application Based Intrusion Detection Systems (AIDS)

B.
Network Based Intrusion Detection System (NIDS)

C.
Intrusion Prevention System (IPS)

D.
Host Based Intrusion Detection System (HIDS)

Explanation:
An IPS detects intrusive activity and also prevents the traffic from gaining access to the target.
Incorrect Answers:
A, B, D: Intrusion Detection Systems detect intrusive activity and generates an alert. It does not take action
when a possible intrusion is detected.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 255-266