Which of the following types of firewalls ensures that the packets are part of the established session?
A. Stateful inspection firewall
B. Circuit-level firewall
C. Application-level firewall
D. Switch-level firewall Answer: A Section: MIX QUESTIONS Explanation
Explanation/Reference:
A stateful firewall is a network firewall that tracks the operating state and characteristics of network connections traversing it. The firewall is configured to distinguish legitimate packets for different types of connections. Only packets matching a known active connection (session) are allowed to pass the firewall.
References: https://en.wikipedia.org/wiki/Stateful_firewall
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Answer is A, Stateful Firewall keeps track of previous packets.
“circuit-level gateways monitor TCP handshakes and other network protocol session initiation messages across the network as they are established between the local and remote hosts to determine whether the session being initiated is legitimate — whether the remote system is considered trusted. They don’t inspect the packets themselves, however.”
https://searchsecurity.techtarget.com/feature/The-five-different-types-of-firewalls