Cisco CCNA Exam Tutorial Configuring Standard Access Lists
Access Control Lists (ACLs) allow a router to permit or deny packets based on a variety of criteria. The ACL is configured in global mode, but is applied at the interface level. An ACL does not take effect until it is expressly applied to an interface with the ip access-group command. Packets can be filtered as they enter or exit an interface.
If a packet enters or exits an interface with an ACL applied, the packet is compared against the criteria of the ACL. If the packet matches the first line of the ACL, the appropriate ,permit, or ,deny, action is taken. If there is no match, the second line?s criterion is examined. Again, if there is a match, the appropriate action is taken; if there is no ma...
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