False negatives occur when the IDS does not alert on an attack or malicious activity that is present. This is much more of a concern than false positives--at least the IDS is detecting something with those.
B - False Positive means that the IDS failed to identify a true incident, False Negative is actually a false identification of something that is legit.
I think you have that backwards. I always do that in regards to True and False graphs. In terms of Alerts (motion detector for example), if sensivity is to high, you get alot of False Positives (false readings). If it is to low, you can get False negatives (no reading at all when there should be).
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