Chapter 6
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 (ACLs) allow network engineers to program a filter into a router. Each router, on each interface, for both the inbound and outbound direction, can enable a different IP ACL with different rules. Each IP ACL’s rules tell the router which packets to discard and which to allow through.
This chapter discusses the basics of IPv4 ACLs, specifically a type by the name standard numbered IP ACLs or simply standard access lists. Standard numbered ACLs use simple logic, matching on the source IP address field only, and use a configuration style that references the ACL ...
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