write a short notes on firewall
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It is a hardware or a software that protects your computer from viruses and other threats.
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A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.
Firewall is a security barrier between two networks that screens traffic coming in and out of the gate of one network to accept or reject connections and services according to a set of rules. A firewall is like a secretary for a network which examines requests for access to the network.
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