Describe the “three Ps” rule associated with access control lists.
One ACL per protocol:
- To control traffic flow on an interface, an ACL must be defined for each protocol enabled on the interface.
One ACL per direction:
- ACLs control traffic in one direction at a time on an interface. Two separate ACLs must be created to control inbound and outbound traffic.
One ACL per interface:
- ACLs control traffic for an interface, such as Fast Ethernet 0/0.
Exam with this question: EWAN v4 Chapter 5 Check Your Understanding: Access Control Lists
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