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A firewall is an example of which type of access control:
Preventive
Detective
Deterrent
A firewall prevents types of access, so it's a preventive control. Some things can perform more than one control function depending on the situation, but you have to consider an implement in light of the function it best performs. Firewalls are not a deterrent control, and their logs can be used as detective controls but those depend on the firewall and are not self-sufficient.
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