ISDN is referenced by a suite of ITU-T (International
Telecommunication Union Telecommunication Standardization
Sector) standards encompassing what three layers of the OSI
reference model?
A. Physical
B. Data Link (LAPD)
C. Data Link (RMON)
D. Network (Q.930 and Q.931)
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Answer: A, B, and D
ISDN is referenced by a suite of ITU-T (International
Telecommunication Union Telecommunication Standardization
Sector) standards encompassing the Physical, Data-Link
(LAPD), and Network (Q.930 and Q.931) layers of the OSI
reference model.
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