text: what is the use of access list in cisco router? i need lot of examples for acl acl - access control list.  it is used to limit traffic through the router much in the same way as normal firewall rules.  example: access-list 100 permit tcp any host 171.16.23.1 eq 80  this would allow any computer to access a webserver on the computer at ip address 171.16.23.1  the following link has alot of good examples.