An administrator has set up a NIPS and connected it to the same switch as the internal firewall
interface and the internal router. The device, however, only detects traffic from itself to the firewall
or router. Which of the following explains why additional corporate traffic cannot be detected?

A.
The spanning tree protocol is preventing the traffic.

B.
Port Mirroring is set up incorrectly.

C.
The switch needs to be a layer 3 switch.

D.
The traffic is in a classless IP range and not classful IP range.

Explanation: