Firewall

Firewall is a guarantee that the network safe way. Firewall can safely be in a separate router is used to filter doesn't want packets, also can be installed on a router and host, play a greater network security protection. Firewalls are widely used to let users in a safety barrier, after access to the Internet is used to crush a enterprise public network server and enterprise internal network separated. In addition, firewall can also be used to protect the enterprise internal network a certain part of the safety. For example, a research or accounting subnet could quite easily by from the inside of the enterprise internal network lurk.