What is firewall? and write the types of firewall?
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A wall to inhibit or prevent the spread of fire is called firewall.There are 5 types of firewall- Packet filtering firewall, Circuit level gateways,Stateful inspection firewall, Application level gateways and next gen firewalls.
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A firewall is a technique used in a secured computer system or network to block unathorized users and allow only the athorized user.
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