3
he reset button restarts the firewall. It does not restore the factory defaults.
Rear panel
Figure 2 Rear panel
Mechanism of firewalls
About firewalls
A firewall is a network security device typically located at the network perimeter to isolate networks
with different security levels as needed, protecting one network against attacks and intrusions from
another network. You can configure the firewall to permit valid traffic and deny invalid traffic.
A firewall controls network traffic mainly based on security zones and security policies.
Interfaces and security zones
As shown in Figure 3, you can configure security zones to implement security zone-based security
management. A security zone is a logical concept that indicates a collection of interfaces that have
the same security requirements.
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