Cisco Access Lists
You can use ACLs to provide packet filtering at the router level. You can use ACLs extensively at a firewall to protect your internal network from the outside world. This section outlines the different types of ACLs that are available to you and the rules (we prefer the word guidelines) for creating ACLs. A wide variety of ACLs can be leveraged to provide additional layers of security on your network. We talk about a few types of access lists.
 | When building ACLs, note that there is an implicit deny statement at the end of the access list. |
Standard
Standard ACLs filter traffic based on the network only, and they are not as granular ...
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