Firewall acts as a barrier between Local Area Network and the Internet. It helps in keeping private resources confidential and avoids the security risks. Network traffic is controlled in both ways.
Below diagram shows the sample firewall between LAN and the Internet. Filtering network traffic can be done by both hardware and software.
We have two types of Firewall system, one working with filters at network layer and other by using proxy servers at the user, application or network layer.
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