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Firewall Security
A Firewall is a dedicated network box (usually
implemented in the organisation's "gateway" router) situated
between the Internet and an organisation's private network, thus:
There are three classes of Firewall:
- Packet filtering firewalls
- Application gateways
- Circuit level gateways
Of these, the packet filtering type is the most common.
Because the firewall is not a general-purpose host, it does not
itself run any vulnerable server processes.
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