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Packet filter routers training

The Cisco ACL is one of the most available packet filters found today. The means by which a Cisco router filters packets is known as an access control list (ACL). 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. This is the basis of the traffic-control features of a Cisco router.
A routing device, without packet filtering, looks at a packet抯 destination address and decides whether or not this packet has to be routed through the router or should remain on that interface. This is a basic principle that routing works under.
When you add packet filtering, you add another level of analysis for each packet. The first step is still examination of the destination address. Then, if the router has determined it has to process the packet, it applies its filter 搑ules?
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