The Cisco Router as a Packet Filter

The Cisco Router as a Packet Filter

1. The Cisco ACL is one of the most available packet filters found today.

2. The means by which a Cisco router filters packets is known as an

access control list (ACL).

3. An ACL serves as a laundry list of things for the router to look at in the

packet header, to decide whether the packet should be permitted or

denied access to a network segment.

4. This is the basis of the traffic-control features of a Cisco router.

The Cisco Router as a Packet Filter

1. Routers are a convenient choice for network filtering because they are

already a part of your network's infrastructure.

2. One is located at your network's furthermost edge as well as at the

intersections of all your network segments.

3. If you want to keep something out of a network segment, the

furthermost point is the best place to screen it.