Using ACLs, you can apply a number of features, such as encryption, policy-based routing,
quality of service (QoS), dial-on-demand routing (DDR), Network Address Translation (NAT),
and Port Address Translation (PAT), to the classi?¬?ed packets.
You can also con?¬?gure standard and extended Cisco IOS ACLs on router interfaces for access
control (security) to control the type of traf?¬?c that is permitted through a given router. Cisco IOS
features are applied on interfaces for speci?¬?c directions (inbound versus outbound). This
chapter describes the operation of different types of ACLs and shows you how to con?¬?gure IP
version 4 (IPv4) ACLs.
Chapter Objectives
Upon completing this chapter, you will be able to determine how to apply ACLs based on
network requirements and con?¬?gure, verify, and troubleshoot ACLs on a medium-sized
network. This ability includes being able to meet these objectives:
?– Describe the different types of IPv4 ACLs
?– Con?¬?gure and troubleshoot standard and extended, numbered and named IPv4 ACLs
Access Control List Operation
Understanding the uses of access control lists (ACL) enables you to determine how to
implement them on your Cisco network.
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