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Data Link Protocol - Multiple Choice Questions and Answers | Page-2

Questions
6 X.25 LAPP uses a specific subset of
A CSMA/CD protocol
B HDLC protocol
C Token ring
D None of the above

Answer: Option [B]
7 X.21 protocol consists of
A Physical and frame levels
B Frame and packet levels
C Physical, frame and packet levels
D Only physical level

Answer: Option [D]
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8 Which of the following timers is NOT used by FDDIMAC protocol ?
A Token holding timer
B Token rotation timer
C Valid transmission timer
D None of these

Answer: Option [D]

FDDI MAC protocol uses three times. The token holding timer (determines duration for which a station can transmit after acquiring token). The Token rotation timer (is restarted every time the token is seen) and valid transmission timer (used to time out and recover from certain transient ring errors).

9 The shortest frame in HDLC protocol is usually the
A Information frame
B Management frame
C Supervisory frame
D None of the above

Answer: Option [C]
10 Digitization is a combination of sampling and
A Pulse coding
B Shift keying
C Quantization
D None of the above

Answer: Option [C]

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