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If the IDS cannot keep up with the amount of traffic, it will:
Let them all pass
Hold them all back
None of these
Selectively let them pass
Due to the fact that passive IDS are inherently fail-open (as opposed to fail-closed), launching a denial-of-service attack against the IDS on a network is a feasible method of circumventing its protection. An adversary can accomplish this by exploiting a bug in the IDS, consuming all of the computational resources on the IDS, or deliberately triggering a large number of alerts to disguise the actual attack. https://en.wikipedia.org/wiki/Intrusiondetectionsystemevasiontechniques EDIT: this doesn't say anything about "by default" and it configured to drop the traffic aka "hold them all back".
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