In previous article we discussed about Access Control Lists, generally. Here we’ll focus on Standard Access Lists on Cisco devices and will give you an example.

With standard ACLs you can permit or deny traffic from source IP addresses. The destination of the packet and the port doesn’t matter. They can be named or numbered. 

Access Control Lists are used to control traffic into and out of your network based on a given criteria. An  ACL consists of a sequence of permit or deny statements that apply to network layer or upper layer protocols. Most often Access Control Lists are used for security reasons to filter traffic.