Access control list (ACL)
Also called: ACL
Course: AP® Cybersecurity Shows up in: Unit 3: Securing Networks
The ordered set of rules a firewall uses to permit or deny inbound and outbound traffic; the first matching rule is executed.
Appears in the course and exam description (CED): 3.4.B.13.4.B.23.4.B.3
Why it matters in Unit 3
Rule order changes what gets through.
Example
Rule 1: DENY inbound transmission control protocol (TCP) 443 from a bad range. Rule 2: ALLOW inbound TCP 443 from ALL.
Learn it properly, with a checkpoint 3.4 Protecting Networks: Firewalls