Which of the following can be thought of as the simplest and almost cheapest type of firewall?
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A.
stateful firewall
B.
hardware firewall
C.
PIX firewall
D.
packet filter
E.
None of the choices.
Explanation:
The simplest and almost cheapest type of firewall is a packet filter that stops messages with inappropriate
network addresses. It usually consists of a screening router and a set of rules that accept or reject a message
based on information in the message header.