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Firewalls

If you accept the idea that encryption and 802.1x do not provide adequate protection for a wireless LAN, the next logical step is to find another way to keep intruders out of your network. You also need a firewall.

A firewall is a proxy server that filters all the data that passes through it on the way to or from a network, based on a set of rules established by the network manager. For example, a firewall might reject data from an unknown source or files that match a particular source (such as a virus). Or it might pass all data moving from the LAN to the Internet, but only allow certain types of data from the Internet. The most common use of a firewall in a LAN is at the gateway to the Internet, as shown in Figure 12-4. The firewall monitors all inbound and outbound data between the computers on the local network on one side and the Internet on the other. This kind of firewall is intended to protect the computers on the LAN from unauthorized access from the Internet.


  

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