Which of the following is the SIMPLEST type of firewall?

A.
Stateful packet filtering firewall

B.
Packet filtering firewall

C.
Dual-homed host firewall

D.
Application gateway

Explanation:
Packet filtering was the first generation of firewalls and it is the most rudimentary type of all of the firewall
technologies.
Incorrect Answers:
A: A stateful packet filtering firewall is more complicated compared to the Packet filtering firewall, since the
latter is stateless.
C: Dual-homed is a firewall architecture, not a firewall type.
A Dual-homed firewall refers to a device that has two interfaces: one facing the external network and the other
facing the internal network.
D: Application -level gateways are known as second generation firewalls, while packet filtering is a first
generation firewall

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 630