Which of the following statements about packet filter firewalls is not true?
A. They can filter traffic based on the port number.
B. They can filter traffic based on the protocol type.
C. They can filter traffic based on the state of the connection.
D. They can filter traffic based on the source and destination address.
Answer: C
Explanation: Packet filter firewalls can filter traffic based on the protocol, port number, and addresses but cannot keep track of the state of the connection.
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