[Solved] Which of the following is NOT a type of firewall?

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Q.	Which of the following is NOT a type of firewall?
A.	Packet filtering firewall
B.	Circuit-level gateway
C.	Stateful inspection firewall
D.	Data encryption
Answer» D. Data encryption
Explanation: Data encryption is a method of protecting data, not a type of firewall. Firewalls can be implemented through various technologies like packet filtering, circuit-level gateways, etc.

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