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Access control lists, also known as ACLs or access lists, are rule-based lists that are used by switches and routers to identify traffic. They can identify traffic based on source address, destination address and port numbers.
The most common use for an access list is to deny or permit traffic, but there are other uses for Access Lists such as configuring Network Address Translation (NAT) and Quality of Service (QoS).
Standard Access List
Standard access lists only use the source address to identify traffic.
A standard access list uses numbers between 1 – 99.
Cisco decided to expand this to also include 1300 – 1999
Extended Access List
Extended access lists allow us to identify traffic based on the destination address, protocol and port number.
Extended access lists use numbers 100 – 199 and expanded numbers 2000 – 2699.
Named Access List
A name access list allows standard or extended access list to be given names rather than numbers. If you have multiple access lists on a device, named lists makes it easier to identify what each list does making them easier to manage.
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