Question: a) Give the simple stateful packet inspection firewall rule for packets that do not attempt to open connections? b) UDP is connectionless. How is it

a) Give the simple stateful packet inspection firewall rule for packets that do not attempt to open connections?
b) UDP is connectionless. How is it possible for an SPI firewall to handle UDP connections?
c) Is SPI filtering for packets that are part of ongoing communications usually simple and inexpensive? Explain.

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