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Exam CISM topic 1 question 1118 discussion

Actual exam question from Isaca's CISM
Question #: 1118
Topic #: 1
[All CISM Questions]

Which of the following trends would be of GREATEST concern when reviewing the performance of an organization's intrusion detection systems (IDSs)?

  • A. Increase in false negatives
  • B. Increase in false positives
  • C. Decrease in false positives
  • D. Decrease in false negatives
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Suggested Answer: A 🗳️

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isaphiltrick
Highly Voted 3 months, 4 weeks ago
Selected Answer: A
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.
upvoted 8 times
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Saisharan
Highly Voted 6 months, 3 weeks ago
False negatives happen when the IDS fails to detect actual malicious activity, So Option A
upvoted 5 times
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Bl1024
Most Recent 4 months, 3 weeks ago
Selected Answer: B
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.
upvoted 1 times
fac161f
2 months, 1 week ago
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).
upvoted 1 times
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C (25%)
B (20%)
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