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Cisco CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

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Chapter 22. Basic IPv4 Access Control Lists

Most every other topic in the scope of CCENT focuses on achieving a core goal of any TCP/IP network: delivering IPv4 packets from the source host to the destination host. This chapter, along with the next chapter, focuses instead on preventing a subset of those packets from being allowed to reach their destinations, by using IPv4 access control lists (ACL).

IPv4 ACLs have many uses, but the CCENT exam focuses on their most commonly known use: as packet filters. You want hosts in one subnet to be able to communicate throughout your corporate network, but maybe there is a pocket of servers with sensitive data that must be protected. Maybe government privacy rules require you to further secure and protect ...

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