The term firewall was initially taken from the concept of constructing walls to stop spreading of fire.
This concept is used in networking to prevent unwanted traffic entering a certain area of network.
Common properties of firewalls
- Firewalls has an access control policy
- Acts as the transit point between networks
- Firewalls are resistant to attacks
Common Types of Firewalls
- Statefull Firewall : Monitors the traffics state of connection (initiation , date transfer or a termination of state)
- Packet filtering firewall : The router filters the packets contents
- Proxy firewalls : Filters information at the layers of 3, 4, 5 and 7 of the OSI model.
Next generation firewalls
Next generation firewalls are more advanced than the state full firewalls in various ways.
They have a granular identification method with visibility and controls of behaviors in the applications. Next gen firewalls has a proactive protection against the threats of the internet. Policies could be enforced based on the device, user, role, threat profile or on the application type.
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