Which of the following usually provides reliable, real-time information without consuming network or host resources? 

Answer options:

A. network-based IDS
B. host-based IDS
C. application-based IDS
D. firewall-based IDS

A

A network-based IDS usually provides reliable, real-time information without consuming network or host resources. Source: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 48.