Which of the following monitors network traffic in real time?

A.
network-based IDS

B.
host-based IDS

C.
application-based IDS

D.
firewall-based IDS

Explanation:
On-line network-based IDS monitors network traffic in real time and it analyses the Ethernet packet and applies
it on the same rules to decide if it is an attack or not.
Incorrect Answers:
B: A host-based intrusion detection system (HIDS) monitors and analyzes the internals of a computing system,
as well as the network packets on its network interfaces in certain instances.
C: An application-based IDS is designed to monitor a specific application.
D: Firewalls are different to IDS because it looks outwardly for intrusions in order to stop them from happening.

https://en.wikipedia.org/wiki/Intrusion_detection_system
https://en.wikipedia.org/wiki/Host-based_intrusion_detection_system