Cisco Systems. Interconnecting Cisco Network Devices. Volume 2

Cisco Systems, 2006. — 234 p.Standard and extended Cisco IOS access control lists (ACLs) are used to classify IP packets. You can apply a number of features, such as access control (security), encryption, policy-based routing, quality of service (QoS), Network Address Translation (NAT), and port address translation (PAT), to the classified packets. You can also configure standard and extended IOS ACLs on router and switch interfaces. IOS features are applied on interfaces for specific directions (inbound versus outbound). Some features use ACLs globally. This module describes the operation of different types of ACLs and shows you how to configure IP ACLs.