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Data Link Protocol - Multiple Choice Questions and Answers | Page-4

Questions
16 In which ARQ, when a NAK is received, all frames sent since the last frame acknowledge are retransmitted
A Go back n
B Stop-and-wait
C Selective Reject
D Both A and B

Answer: Option [A]
17 Not a function of a data link protocol
A Error control
B Message delineation
C Media access control
D Amplitude shift keying

Answer: Option [D]
18 AAl2 is useful for
A Constant bit rate
B Variable bit rate
C Connection oriented packet data
D Connectionless packet data

Answer: Option [B]
19 Which of the following signals is not standard RS-232-C signal ?
A RTS
B CTS
C VDR
D DSR

Answer: Option [C]
20 An internetworking protocol that provides virtual circuit service across multiple X.25 protocol, is
A X.75
B X.25
C X.21
D X.400

Answer: Option [A]

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