____ is an updated, digital version of X.25 that also relies on packet switching.
A) DSL
B) ISDN
C) Frame relay
D) ATM

Question

Quizplus · Accepted Answer

Frame relay is an updated, digital version of X.25 that also relies on packet switching. DSL and ISDN are digital communication technologies, but they do not rely on packet switching. ATM is a different technology that also uses packet switching, but it is not an updated version of X.25.

____ Is an Updated, Digital Version of X