What are firewalls typically classified into?

Firewalls are typically classified into network firewalls and host-based firewalls based on their deployment locations and functions.

Network firewalls are implemented at the perimeter of a network and are designed to protect the entire network by monitoring and controlling incoming and outgoing traffic based on predetermined security rules. They usually operate at the network layer, filtering traffic between different networks, and are essential for providing a barrier against external threats.

Host-based firewalls, on the other hand, are installed on individual devices, such as computers or servers, and are designed to protect those specific machines from unauthorized access and threats. They can monitor and control traffic to and from the device itself, offering a more granular level of protection.

The other classifications, such as software and hardware firewalls, refer more to the implementation and physical form factors rather than the scope of protection provided. Similarly, private and public firewalls are not standard categories recognized in the security community. Intrusion detection and application firewalls represent specific technologies or functions rather than broad classifications of firewalls. Thus, classifying firewalls as network and host-based is the most comprehensive and widely accepted categorization in the field of network security.