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31 Days Before Your CCENT Certification by Scott Bennett

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CCNA Discovery 2, Chapter 8

8.2.2: The Cisco IOS Firewall software is included with the Cisco IOS. It allows you to control traffic between networks with access lists. In addition, routers can filter packets dynamically and monitor communication with a state table. A stateful firewall uses this dynamic monitoring to guarantee that all traffic belongs to legitimate communications.

On larger networks you usually design firewall security in layers. Border routers filter packets and route traffic to the DMZ or an internal firewall. The internal firewall only allows outside traffic that was specifically requested by an internal device. Additional internal firewalls may separate and protect sensitive areas such as network devices containing financial ...

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