Specific services will be allowed or banned based on an extended access list. From 100 to 199, then from 2000 to 2699, an extended ACL is established. Remember rules cannot be deleted if they are numbered with an expanded Access-list.
ACLs are a set of permit and deny conditions, often known as rules, that provide security by preventing unauthorised users from accessing specified resources while allowing authorised users to do so. ACLs can prevent unauthorised access to network resources.
Only one ACL per interface, per protocol, and per direction is allowed, i.e., only one inbound and outbound ACL per interface is allowed.
Use the show access-lists privileged EXEC command to see the contents of current access lists. Use the show ip access-list EXEC command to see the contents of all current IP access lists.
The access list number for typical IP access lists can range from 1 to 99 in all software releases. From 1300 to 1999, standard IP access lists in Cisco IOS Software Release 12.0. 1 began adding additional numbers. The expanded range is the term used to describe these additional numbers.
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