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Which of the following types of firewalls ensures that the packets are part of an established session?
Stateful Inspection firewall
Application-level firewall
Circuit-level firewall
Switch-level firewall
See --> http://searchnetworking.techtarget.com/tutorial/Introduction-to-firewalls-Types-of-firewalls. EDIT: This appears to be very misleading. Certainly stateful inspection can be used to verify incoming TCP packets are part of a session. But...https://en.wikipedia.org/wiki/Circuit-level_gateway states that circuit-level firewalls "monitor TCP handshaking between packets to determine whether a requested session is legitimate. " Which certainly seems to be the answer to the question.
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