Identify three types of firewalls from the options below:

The correct answer highlights three recognized types of firewalls that perform distinct functions in network security.

Packet filtering firewalls operate at the network layer, examining packets of data and allowing or blocking them based on predefined rules. This method doesn't keep track of the state of connections, meaning it doesn't recognize whether packets are part of an established session.

Application proxy firewalls, on the other hand, function at the application layer and serve as intermediaries between users and services. They inspect the data packets in greater detail, allowing them to enforce security policies based on the application-level content, effectively hiding the internal network.

Stateful inspection firewalls represent a more advanced technology. They monitor the state of active connections and make decisions based on both the rule set and the context of the traffic. This ability to track the state of established connections greatly enhances security compared to basic packet filtering.

Thus, the answer correctly identifies three different types of firewalls that serve various critical roles in controlling network traffic: Packet Filtering, Application Proxy, and Stateful Inspection are all fundamental designs that contribute significantly to network defense and management strategies.