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CompTIA Security+ study material · question 387 of 611

What risk does an intrusion prevention system carry that an intrusion detection system does not?

  1. It cannot inspect encrypted traffic
  2. It cannot detect novel attacks
  3. It cannot be updated with new signatures
  4. Sitting inline, it can drop legitimate traffic and cause an outage
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Answer: D. Sitting inline, it can drop legitimate traffic and cause an outage

The ability to block is exactly what creates the availability risk that a passive sensor does not have.

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