The following description of the intrusion fire protection system IPS, which is correct?

The following description of the intrusion fire protection system IPS, which is correct?
A . The port IPS can be concatenated at the network boundary.
B. The IPS cannot prevent intrusion from occurring in real time.
C. The port IPS can be attached to the switch and port mirrored through the switch.
D. Oral IPS has the ability to customize intrusion prevention rules.

Answer: A,C,D