CISSP Question #1231: Real Exam Question with Answer & Explanation

The correct answer is C: Circuit-level firewalls. Circuit-level firewalls are a type of firewall that only examines the "handshaking" between packets before forwarding traffic. Circuit-level firewalls operate at the transport layer of the OSI model, and they establish a virtual circuit or session between the source and the desti

Submitted by dimitri_ru· Mar 5, 2026Communication and Network Security

Question

Which of the following types of firewall only examines the "handshaking" between packets before forwarding traffic?

Options

AProxy firewalls
BHost-based firewalls
CCircuit-level firewalls
DNetwork Address Translation (NAT) firewalls

Explanation

Circuit-level firewalls are a type of firewall that only examines the "handshaking" between packets before forwarding traffic. Circuit-level firewalls operate at the transport layer of the OSI model, and they establish a virtual circuit or session between the source and the destination hosts. Circuit-level firewalls do not inspect the content or the header of the packets, but they only verify that the packets belong to a valid and established session. Circuit-level firewalls are faster and less resource- intensive than other types of firewalls, but they provide less security and visibility.

Topics

#Firewall types#Circuit-level firewall#Network security

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