Applying a Standard ACL to an Interface

Router(config)#int fa0/0
Router(config-if)#ip access-group 10 in	Takes all access list lines that are defined as being part of group 10 and applies them in an inbound manner. Packets going into the router from FA0/0 will be checked

Tip:

Access lists can be applied in either an inbound direction (keyword in) or in an outbound direction (keyword out).