Basic IP Traffic Management with Access lists

Introduction : 

The Access Control List (ACL) is a set of commands, which are grouped together. These commands enable to filter the traffic that enters or leaves an interface. A wildcard mask enables to match the range of address in the ACL statements. There are two references, which a router makes to ACLs, such as, numbered and named. These reference support two types of ;filtering, such as standard and extended. You need to first configure the ACL statements and then activate them.