Which one of the following is a circuit level application gateway and works independent of any
supported TCP/IP application protocol?

A.
SOCK-et-S (SOCKS)

B.
Common Information Model (CIM)

C.
Secure Multipurpose Internet Mail Extension (S/MIME)

D.
Generic Security Service Application Programming Interface (GSS-API)

Explanation:

“Socks Proxy Server Characteristics Circuit-level proxy server Requires clients to be SOCKS-fied with
SOCKS client software Mainly used for outbound Internet access and virtual private network (VPN)
functionality Can be resource-intensive Provides authentication and encryption features to other
VPN protocols, but not considered a traditional VPN protocol” Pg. 422 Shon Harris CISSP All-In-One
Certification Exam Guide Reference: The SOCKS is an example of a circuit-level proxy gateway that
provides a secure channel between two computers. pg. 379 Shon Harris CISSP