Date Added: Jan 2012
Firewalls are the devices that the authors are used to protect data. It might be configured to allow certain devices or applications to access their network. The Firewalls are termed as stateful devices. Traditional firewalls typically need to inspect each packet to ensure that it adheres to the policy that has been configured or not, and then perform the necessary action associated to that particular rule. There are various actions and they are typically allow, deny, or even NAT the packet. Many Personal Computer Operating Systems include software-based Firewalls to protect against threats from the public Internet.