The point of ACLs is to filter the traffic which passes through your router. I don’t know of any network which should permit any traffic type to enter or leave it.
As well as filtering traffic, ACLs can be used to reference NAT pools, to filter your debugging commands, and with route maps (this is outside of the CCNA syllabus requirements). Depending upon the type of ACL you configure, you can filter traffic based on source network or IP addresses, destination network or IP addresses, protocols, or port numbers. You can apply ACLs to any router interface, including your . . .
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