Which of the following types of firewall functions by creating two different communications, one between the client and the firewall, and the other between the firewall and the end server?

A stateful firewall tracks the state of active connections and allows return traffic, but it forwards packets directly between client and server rather than creating two separate communication sessions.

A proxy-based (application proxy) firewall terminates the inbound client connection at the firewall itself, inspects the application-layer data, and then opens a second independent connection to the destination server on the client's behalf. This two-connection model allows deep content inspection and completely hides the internal network topology from external hosts.

A packet filter firewall inspects individual packets based on header fields (IP, port, protocol) without maintaining session state or proxying connections - it does not split the communication into two sessions.

Endian Firewall is a specific Linux-based UTM appliance product name, not a category of firewall defined by its connection-handling behavior.