Which of the following is a 'preventive' control in the context of network security?

Answer options:

Firewall rules blocking traffic on port 80.

Intrusion Detection System (IDS) alerts.

Review of server access logs.

Incident response plan execution.

How to approach this question

Classify controls: Preventive (stops it), Detective (spots it), Corrective (fixes it).

Full Answer

A.Firewall rules blocking traffic on port 80.✓ Correct

A firewall actively blocks unauthorized traffic based on rules, preventing the threat from reaching the network. IDS and logs merely record the event.

Common mistakes

Confusing IDS (Detective) with IPS (Preventive).

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