Implementing Access Controls Lists (ACLs)

Whenever you need to interconnect two or more different networks, the router is always the preferred choice. This is simply because the primary function of a router is to forward packets between networks. However, the Cisco IOS router has many more features than simply forwarding. One major feature is that it filters traffic based on its source and destination. This feature enables the Cisco IOS router to perform packet filtering similarly to a firewall appliance on the network.

During the course of this chapter, you will learn how access control lists (ACLs) can be applied on a Cisco IOS router to filter both inbound and outbound traffic. Furthermore, you will discover the various types of ACLs and how they can be used in various situations to allow or deny traffic between networks.

This chapter covers Domain 5: Security Fundamentals, objective 5.6 Configure and verify access control lists, of the 200-301 CCNA v1.1 Certification exam...