![]() ![]() Bencsáth Boldizsár adjunktus BME Hálózati Rendszerek és Szolgáltatások TanszékĢ What is a firewall? a firewall is a system or group of systems that enforces some network access control policy usually, the policy is defined by filtering rules each incoming and outgoing packet is matched against the filtering rules and it is either allowed to pass or dropped external network incoming traffic filtered traffic firewall filtered traffic outgoing traffic internal network filtering rules 2ģ Motivation for firewalls it is very difficult (expensive) to secure all hosts and servers individually inside a network even if that was possible, mistakes may still happen an example scenario (based on a true story): a gateway malfunctions on weekend, and no usual system admins are available. 1 Adatbiztonság a gazdaságinformatikában Tűzfalak, IDS október 7.
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