The term firewall was derived from an automobile division. It actually means a segment that is extricated to release the engine screened-off area from the core of the automobile. But in the network world, it is used as a general term for how we isolate our internal network from outside attacks and threats. A firewall can be defined as any hardware or software that enables the filtering of packets or controls the flow of traffic. They are generally implemented at the perimeter of the network. They act as a border for trusted and untrusted zones.
For a company that secures the network and data, it will add complexity to the network administrator. The costs of maintaining and implementing such a high level of security, such as e-commerce, intranet, extranet, and email services, are always high, but when compared to the loss that is incurred due to the...