What is a Firewall Used for?

Answer

A firewall is a device that is permits or blocks network transmissions based on a set of specified rules. They are used to protect networks against access by unauthorized individuals while allowing authorized users of the network to have access to the network. firewalls can also help to prevent the spread of viruses through the network by blocking the virus' access to individual computers.
6 Additional Answers
Firewalls are hardware devices or software programs that are run on secure host computer to prevent computers from intentional hostile intrusion. They examine the traffic routed between the networks to check whether it meets a given criteria. They protect the computers against virus.
A firewall is a device which controls the communications flow across computer networks by examining their type, source and destination then it compares them with predetermined lists of allowed and disallowed transactions. There is a software firewall and a hardware firewall.
A firewall can be described as part of a computer network system that is designed to block unauthorized access while on the other hand permitting outward communication. Its significant is seen in the protection of private networks connected to the internet. This is done by using a specific software or hardware.
Firewall is a noun that refers to a wall or a partition that is designed to prevent fire from spreading. It is normally a barrier intended to thwart the spread of a destructive agent. It could be inside a car as a barrier to limit the spread of fire.
it protects networked computers from intentional hostile intrusion that could compromise confidentiality or result in data corruption or denial of service.
A firewall is a computer system that restricts external access to a computer usually from the internet or a local area network. Firewalls are usually located at gateway servers and can either protect individual computers or a network of computers.
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