Which of the following network appliances will only detect and not prevent malicious network
activity?

A.
IDS

B.
Network sniffer

C.
IPS

D.
Firewall

Explanation:
An intrusion detection system (IDS) is a device or software application that monitors network or
system activities for malicious activities or policy violations and produces reports to a management
station. Some systems may attempt to stop an intrusion attempt but this is neither required nor
expected of a monitoring system.