Chapter 2. Basic IPv4 Access Control Lists
This chapter covers the following exam topics:
5.0 Security Fundamentals
5.6 Configure and verify access control lists
IPv4 access control lists (ACL) give network engineers the ability to program a filter into a router. Each router, on each interface, for both the inbound and outbound direction, can enable a different ACL with different rules. Each ACL’s rules tell the router which packets to discard and which to allow through.
This chapter discusses the basics of IPv4 ACLs, and in particular, one type of IP ACL: standard numbered IP ACLs. Standard numbered ACLs use simple logic, matching on the source IP address field only, and use a configuration style that references the ACL using a number. This ...
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