Which Cisco security mechanism is this?

A Cisco security mechanism has the following attributes:

it is a sensor appliance

it searches for potential attacks by capturing and analyzing traffic

it is a "purpose-built device"

it is installed passively

it introduces no delay or overhead

Which Cisco security mechanism is this?

A.
NIDS

B.
PIX

C.
IKE

D.
HIPS

E.
HMAC

Explanation:
Explanation

Inline IPS and anomaly detection: Cisco has innovated in the area of NIDS by being the first to incorporate NIDS into the IOS on routing and switching platforms. In addition, IPS solutions have inline filtering features that can remove unwanted traffic with programmable features that classify traffic patterns. The Cisco IPS 4200 sensor appliances, Cisco Catalyst 6500 IDSM-2, and the Cisco IOS IPS can identify, analyze, and stop unwanted traffic from flowing on the network. Another set of tools used to prevent distributed DoS (DDoS) attacks and ensure business continuity is the Cisco Traffic Anomaly Detector XT and Guard XT appliances, along with the Cisco Catalyst 6500 Traffic Anomaly Detector Module and Cisco Anomaly Guard Module.

Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 13