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SSCP · Question #1113

An intrusion detection system is an example of what type of countermeasure?

The correct answer is D. Detective. An Intrusion Detection System (IDS) is classified as a detective countermeasure because its primary function is to monitor for and alert about suspicious activities or intrusions rather than actively stopping them.

Submitted by deeparc· Apr 18, 2026Security Concepts and Practices

Question

An intrusion detection system is an example of what type of countermeasure?

Options

  • APreventative
  • BCorrective
  • CSubjective
  • DDetective
  • EPostulative

How the community answered

(38 responses)
  • C
    5% (2)
  • D
    92% (35)
  • E
    3% (1)

Why each option

An Intrusion Detection System (IDS) is classified as a detective countermeasure because its primary function is to monitor for and alert about suspicious activities or intrusions rather than actively stopping them.

APreventative

Preventative countermeasures aim to stop an attack from happening in the first place, such as firewalls or access controls, which is not the primary function of an IDS.

BCorrective

Corrective countermeasures aim to fix or mitigate the impact of an incident after it has occurred, such as backups or disaster recovery plans.

CSubjective

"Subjective" is not a standard category for security countermeasures.

DDetectiveCorrect

An Intrusion Detection System (IDS) primarily functions by monitoring and analyzing network traffic or system logs to identify suspicious patterns or known attack signatures. Its role is to detect intrusions or malicious activities and alert administrators, rather than actively preventing the attack itself.

EPostulative

"Postulative" is not a standard category for security countermeasures.

Concept tested: Types of security countermeasures (Detective control)

Source: https://learn.microsoft.com/en-us/azure/architecture/framework/security/design-network-segmentation#security-controls-in-network-segmentation

Topics

#Intrusion Detection System#Security Controls#Countermeasures#Detective Controls

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