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CCNP^™ Challenge Question

Which of the following are valid ISDN channel types?
(Choose 2)

a)	A
b)	B
c)	C
d)	D

Answer

b)	B
d)	D

Explanation

The ISDN specification defines B channels (for Bearer services), which carry application data, and D channels, which typically carry call setup and control information but can also carry low-speed X.25-encapsulated packets.
A and C are not ISDN channel types.

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