What is firewall?

user153336

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Jun 22, 2013
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A firewall is a network security system, either hardware- or software-based, that controls incoming and outgoing network traffic based on a set of rules.
 

user142405

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Mar 18, 2013
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A firewall is a network security system, either hardware or software based, that controls incoming and outgoing network traffic based on a set of rules.
 

user156204

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Jul 17, 2013
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To prevent unauthorized access to a private network. ISP will do this for you.
 

user156330

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A firewall is a network security system, either hardware- or software-based, that controls incoming and outgoing network traffic based on a set of rules.
 

user113022

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A firewall is a network security system , either hardware or software based that allows or blocks traffic into and out of a private network or the user's computer.Firewall acts as a barrier between a trusted system or network and outside connections, such as the Internet.A firewall can be implemented in both hardware and software,or a combination of both.Many businesses and organizations protect their internal networks using hardware firewalls.