Which one of the following data transmission technologies is NOT packet-switch based?

A.
X.25

B.
ATM (Asynchronous Transfer Mode)

C.
CSMA/CD (Carrier Sense Multiple Access/Collision Detection)

D.
Frame Relay

Explanation:
“Examples of packet-switching networks are X.25, Link Access Procedure-Balanced (LAPB),

Frame Relay, Switched Multimegabit Data Systems (SMDS), Asynchronous Transfer Mode
(ATM), and Voice over IP (VoIP).” Pg 146 Krutz: CISSP Prep Guide: Gold Edition.
http://en.wikipedia.org/wiki/Virtual_circuit