a. Is there only one firewall filtering mechanism? b. What filtering mechanisms do almost all main border firewalls use? c. Do SPI firewalls only do stateful packet inspection? a. What is a state? b....

a. Is there only one firewall filtering mechanism? b. What filtering mechanisms do almost all main border firewalls use? c. Do SPI firewalls only do stateful packet inspection?

a. What is a state? b. Are most packets part of the connection-opening state or the ongoing communication state? c. Why is the answer to Question 5b important for stateful packet inspection’s efficiency? d. What is a connection? e. How is a connection between two programs on different computers represented?