Which process on a firewall makes permit/deny forwarding decisions based solely on address and
service port information?

A.
Circuit Proxy

B.
Stateful Packet Inspection Proxy

C.
Application Proxy

D.
Transparency Proxy

Explanation:
Circuit-level proxy creates a circuit between the client computer and the server. It
does not understand or care about the higher-level issues that an application-level proxy deals
with. It knows the source and destinations addresses and makes access decisions based on this
information…IT looks at the data within the packet header versus the data within the payload of the
packet. It does not know if the contents within the packet are actually safe or not. – Shon Harris
All-in-one CISSP Certification Guide pg 419-420