Date Added: Nov 2011
A firewall is a gateway that restricts and controls the flow of traffic between networks, typically between an internal corporate network and the Internet. Firewalls may also provide secure gateway services between internal networks. A firewall is a software component that is developed to restrict unauthorized inward network access. It allows outward information flow. It is set up to control traffic flow between two networks by configured permissions like Allow, Deny, Block, Encrypt etc. They are normally employed to avoid illegal access to personal computers or corporate networks from external unsafe entities like the Internet. This paper deals with the developments in networking with respective firewall.