Which one of the following attacks will pass through a network layer intrusion detection system undetected?

A.
A teardrop attack

B.
A SYN flood attack

C.
A DNS spoofing attack

D.
A test.cgi attack

Explanation:
Because a network-based IDS reviews packets and headers, it can also detect denial of service (DoS) attacks

Not A or B:
The following sections discuss some of the possible DoS attacks available.

Smurf
Fraggle
SYN Flood
Teardrop
DNS DoS Attacks"