International Journal of Emerging Technology and Advanced Engineering (IJETAE)
Most organizations need to control the traffic that crosses into and out of their networks to prevent attacks from both the net-work as well as organization perspective. The firewall is a crucial component in the defense mechanisms of every network connected to the internet. It is the first filtering device that sees IP packets that attempt to enter a network from outside and the last device to let an outgoing packet as well. It's like a security guard that uses policies to make filtering decision on every packet that crosses it: whether to let it pass or drop it.