One function of today’s integrated security systems is enabling the user to control network traffic, i.e. data sent and received over the network by applications that are running on the user’s computer. A component that offers such control is called a firewall. There are software and hardware firewalls
There are a great many software firewalls available; some are commercial and some are free of charge. A firewall installed on a gateway (a server that transfers traffic between different networks) is called a server or network-level firewall. Firewalls installed on a user’s computer are called personal firewalls, as they only protect the computers on which they are installed. Personal firewalls are often incorporated in integrated security systems that protect personal computers. One example is the personal firewall in Kaspersky Internet Security 7.0. Viruslist.com - Using leak tests to evaluate firewall effectiveness
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