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Network security barrier. A firewall is a device that guards the entrance to a private network and keeps out unauthorized or unwanted traffic. When people talk about a corporate or enterprise firewall, they normally assume a series of devices guarding all points of entry, thus creating a secure environment "behind" or "inside" the firewall -- as distinct from the untamed and lawless territory that lies "beyond" or "outside". The integrity of this protective barrier depends on the effective deployment, configuration and capabilities of individual firewall devices.

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