ISDN uses a frame format at ISDN Layer 2 that is called ____.
A)LAPB
B)LAPD
C)LAPF
D)None of the above.

Name: ISDN uses a frame format at ISDN Layer 2 that is called ____. A)LAPB B)LAPD C)LAPF D)None of the above.
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Question

Quizplus · Accepted Answer

ISDN Layer 2 uses LAPD (Link Access Procedure for the D Channel) as its frame format. LAPB is used by X.25, while LAPF is used by Frame Relay. Therefore, the correct option is B - LAPD.

ISDN Uses a Frame Format at ISDN Layer 2 That