Describe briefly how firewalls prevent network, Computer Engineering

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Describe briefly how firewalls prevent network.

A firewall is only a program or hardware device which filters the information coming via the Internet connection within your private network or computer system. When an incoming packet of information is flagged through the filters, this is not allowed via the network.

A firewall provides a company tremendous control over how people employ the network.

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Last ant on rod, i want program code for the above question in c language

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