What types of computer attacks are most commonly reported by IDSs?

A.
System penetration

B.
Denial of service

C.
System scanning

D.
All of the choices

Explanation:
Three types of computer attacks are most commonly reported by IDSs: system scanning,
denial of service (DOS), and system penetration. These attacks can be launched locally,
on the attacked machine, or remotely, using a network to access the target. An IDS
operator must understand the differences between these types of attacks, as each

requires a different set of responses.