An intrusion detection system (IDS) should:

A. run continuously

B. ignore anomalies

C. require a stable, rarely changed environment

D. be located on the network

Explanation:

If an intrusion detection system (IDS) does not run continuously the business remains vulnerable. An IDS should detect, not ignore anomalies. An IDS should be flexible enough to cope with a changing environment. Both host and network based IDS are recommended for adequate detection.