Which type of firewall automatically adjusts its filtering rules based on the content of the traffic of existing sessions?

Answer: Dynamic packet filtering

Explanation:

Dynamic packet filtering is the type of fire wall which is used automatically to enabled the modification in the real time based on the traffic content according to the filtering rules.

The dynamic packet filtering also facilitates to monitor the actual state of connection which is active.

It is also used to determine the actual state of network packet and permits the packet of network pass through firewall.