A network administrator implements a security measure that filters all network traffic, blocking any connections from known malicious IP addresses to prevent unauthorized access to the internal network. Which type of security control is being described?
Detective
Deterrent
Corrective
Preventive
A firewall that filters traffic to block unauthorized access is a classic example of a preventive control. Preventive controls are designed to stop an incident from occurring. In this scenario, the firewall is proactively preventing a potential breach. Detective controls, such as an Intrusion Detection System (IDS), would identify an attack as it happens or after the fact. Corrective controls, like restoring from a backup after a ransomware attack, aim to limit the damage after an incident. Deterrent controls, such as warning banners, are meant to discourage attackers but do not actively block them.
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