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Implementing Cisco Networking Solutions by Harpreet Singh

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Access control lists

Access control lists (ACLs) are used as additional packet filters to allow and block specific packets from flowing on the network. These ACLs are based on information contained in layer 2, layer 3, and layer 4 headers of the packets. The access list help to classify the traffic based on the specific parameters defined in these ACLs, and deny or permit this traffic. ACLs can also be used to identify specific types of traffic and mark them for priority processing on the network, as we will discuss in detail in Chapter 9, Understanding and Configuring Quality of Service.

ACLs on a network can be used to block traffic to/from specific destinations or for certain TCP/UDP ports. An example is where a user might want to allow ...

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