Inspection firewalls keep track of each network connection between internal and external systems.

Stateful.

Explanation:

The firewall technology may be defined as the system used for the prevention of the use of the personal network of other individual. The firewall can be used in the hardware as well as in the software.

Stateful inspection may be defined as the technology used for monitoring the active connections by checking the headers. The internal and external network both can be suspected and continuously checked by the stateful inspection.

Thus, the answer is stateful.

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