Access Control Lists (ACLs)
by Global Knowledge

In this white paper, we'll take a look at access control lists, often referred to as access lists or ACLs (sometimes pronounced "ackels"). In Cisco IOS, ACLs are used for many things, including but not limited to:

  • Filtering data packets (firewalling)

  • Controlling Telnet or SSH access to a router or switch

  • Filtering routing protocols

  • Specifying Quality of Service (QoS)

  • Controlling encryption

  • Controlling NAT (Network Address Translation)

  • Controlling Dial-on-Demand

  • The idea of an access list is straightforward: it permits some things, and denies others. What exactly is being “permitted” or “denied” v...

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