Exam CISA Topic 1 Question 321 Discussion
Actual exam question for ISACA's CISA exam
Question #: 321
Topic #: 1
Question #: 321
Topic #: 1
Which of the following intrusion detection systems (IDSs) will MOST likely generate false alarms resulting from normal network activity?
Suggested Answer: A Vote an answer
Explanation/Reference:
Explanation:
A statistical-based IDS relies on a definition of known and expected behavior of systems. Since normal network activity may at times include unexpected behavior (e.g., a sudden massive download by multiple users), these activities will be flagged as suspicious. A signature-based IDS is limited to its predefined set of detection rules, just like a virus scanner. A neural network combines the previous two IDSs to create a hybrid and better system. Host-based is another classification of IDS. Any of the three IDSs above may be host- or network-based.
Explanation:
A statistical-based IDS relies on a definition of known and expected behavior of systems. Since normal network activity may at times include unexpected behavior (e.g., a sudden massive download by multiple users), these activities will be flagged as suspicious. A signature-based IDS is limited to its predefined set of detection rules, just like a virus scanner. A neural network combines the previous two IDSs to create a hybrid and better system. Host-based is another classification of IDS. Any of the three IDSs above may be host- or network-based.
by Josephine at Aug 11, 2025, 01:40 AM
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