Peer-to-Peer Protocols and Local Area Networks
Given 3 bits for sequence numbers, what is the maximum sliding window size at the receiver in Go Back
3 ARQ?
a) 3
b) 7
c) 8
d) None of the above ️b
Given 3 bits for sequence numbers in Selective Repeat ARQ. If the sender already set the...
Given 3 bits for sequence numbers, what is the maximum sliding window size at the receiver in Go Back
3 ARQ?
a) 3
b) 7
c) 8
d) None of the above ✔️b
Given 3 bits for sequence numbers in Selective Repeat ARQ. If the sender already set the sliding window
size to be 4, what is the maximum sliding window size at the receiver?
a) 3
b) 8
c) 7
d) None of the above ✔️d
If the probability of error is very low in a communication link, which of the following statements is true
about performance of ARQ protocol?
a) Stop-and-wait and Go-back-N ARQ protocols have similar performance
b) Stop-and-wait and Selective Repeat ARQ protocols have similar performance
c) Go-back-N ARQ and Selective Repeat ARQ protocols have similar performance
d) None of the above ✔️c
In peer-to-peer protocol, the purpose of Automatic Repeat Request is
a) to ensure a sequence of information packet is delivered out-of-order
b) to ensure a sequence of information packet is delivered with an ACK request
c) to ensure a sequence of information packet is delivered without errors or duplication despite
transmission errors and losses
d) to ensure a sequence of information packet is delivered in order ✔️c,d
,Which of the basic elements of ARQ is associated with negative acknowledgement
a) Timeout mechanism
b) NAKs
c) Error detecting code
d) ACKs ✔️b
In Go-Back-N ARQ, a procedure where transmission of a new frame is begun before the completion of
time of the previous frame transmission is called
a) Transitioning
b) Pipelining
c) Channeling
d) None of the above ✔️b
In Stop-and-Wait protocol, sequence number are not required
a) True
b) False ✔️b
The disadvantage of Stop-and-Wait protocol
a) Error free communication channel does not exist
b) Acknowledgement may get lost
c) Deadlock situation may occur
d) All of the above ✔️d
Perform the bit stuffing procedure for the following binary sequence: 1101111111011111110101. What
is the outcome?
a) 110111110110111110110101
b) 110111111101111111010100
c) 0010000000100000001010
, d) None of the above ✔️a
Perform bit de-stuffing for the following sequence: 11101111101111100111110.
a) 11101111111111011111
b) 00010000010000011000001
c) 11100111111110011111
d) None of the above ✔️a
PPP is a data link protocol for point-to-point lines in Internet. Its framing is based on which of the
following?
a) Byte stuffing
b) Bit stuffing
c) Word stuffing
d) None of the above ✔️a
HDLC is another data link control protocol widely in use. Its framing is based on which of the following?
a) Byte stuffing
b) Bit stuffing
c) Word stuffing
d) None of the above ✔️b
Which of following statements are true for HDLC?
a) supports various data transfer modes
b) supports multi-point links and point to point links
c) implements error control and flow control mechanisms
d) All of the above ✔️d
In PPP authentication, which of the following is true for Challenge-Handshake Authentication Protocol
(CHAP)
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