What is the difference between a stateful firewall and a proxy firewall?

A.
Stateful firewalls have state, proxy firewalls do not

B.
Proxy firewalls have state; stateful firewalls do not

C.
Stateful firewalls terminate connections, proxy firewalls do not

D.
Proxy firewalls terminate connections, stateful firewalls do not

Explanation:
Answer D is correct; Proxy firewalls terminate connections, including the 3-way TCP handshake. Stateful firewalls do not.

Incorrect Answers and Explanations: A, B, and C: Answers A, B, and C are incorrect. Stateful firewalls have a state table, so A is true, but a weaker answer than D: the key difference is that proxies terminate connections. B is the reverse of A, and therefore false. C is the reverse of the correct answer D, and therefore false.