Chapter 16. Basic IPv4 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. The next chapter, titled, “Advanced IPv4 Access Control Lists,” completes the discussion by describing other types of IP ACLs.

Those of you who have already read the ICND1 100-105 Cert Guide will probably begin to recognize a lot of similar figures and examples. In fact, this chapter’s ...

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