Which statement about an IPS is true？（）
A. The IPS is in the traffic path.
B. Only one active interface is required.
C. Full benefit of an IPS will not be realized unless deployed in conjunction with an ID
D. When malicious traffic is detected，the IPS will only send an alert to a management station.
Which of the following are key characteristics of PPP?（）
A. can be used over analog circuits
B. maps Layer 2 to Layer 3 address
C. encapsulates several routed protocols
D. supports IP only
E. provides error correctio
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