Date Added: Jul 2012
Any data passes through an internal network to an external network there are lot of vulnerable attacks are possible to hack or damage the data. One type of network attack is unauthorised penetration in to network due to openness of networks. It is possible to hack the data and resources of networks. Firewall is the suitable mechanism to protecting the website from attackers. It acts as a security guard between a private network and the outside Internet such that all incoming and outgoing packets have pass through it. Working of a firewall is to examine every incoming or outgoing packet and to decide whether to accept or discard it.