Question: a) Why are stateful packet inspection firewalls inexpensive? b) In practice, are they fairly safe? c) Are SPI firewalls limited to SPI filtering? d) What

a) Why are stateful packet inspection firewalls inexpensive?
b) In practice, are they fairly safe?
c) Are SPI firewalls limited to SPI filtering?
d) What firewall inspection mechanism do nearly all main border firewalls today use?

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