| Summary

| An understanding of the following key points should have been achieved: ACLs perform several functions within a router, including implementing security/access procedures. ACLs are used to control and manage traffic. For some protocols, two ACLs can be applied to an interface: one inbound ACL and one outbound ACL. With ACLs, after a packet is matched to an ACL statement, it can be denied or permitted access to the router. Wildcard mask bits use the number one (1) and the number zero (0) to identify how to treat the corresponding IP address bits. Access list creation and application is verified through the use of various IOS show commands. The two main types of ACLs are standard and extended. Named ACLs allow for the use of a name to identify the access list instead of a number. ACLs can be configured for all routed network protocols. ACLs are placed where they allow the most efficient control. ACLs are typically used in firewall routers. Access lists can also restrict virtual terminal access to the router.