A firewall is a system or system group that runs the security access control between a secure internal network and an untrusted network such as internet.Firewall designed to permit the trusted data or data which is trusted by, refuse service vulnerabilities, preventing the internal network from outside attacks that could penetrate the firewall every time. Generally also used to control access to anyone who has access to a private network from outside parties. Today, the term firewall is a common term that refers to systems that regulate communication between two different networks. Given the many companies currently have access to the&nb...