NWC203 - Course 2 - Peer-to-Peer Protocols And Loc
NWC203 - Course 2 - Peer-to-Peer Protocols and Loc
Exam (elaborations)
NWC203 - Course 2 - Peer-to-Peer Protocols and Local Area Networks
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NWC203 - Course 2 - Peer-to-Peer Protocols and Loc
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NWC203 - Course 2 - Peer-to-Peer Protocols And Loc
NWC203 - Course 2 - Peer-to-Peer Protocols and Local Area
Networks
In networks where errors are infrequent, which approach is favored for efficiency?
Hop-by-hop approach
End-to-end approach
Either one of the above
Neither one of the above ️B
Which of the following statements is true...
NWC203 - Course 2 - Peer-to-Peer Protocols and Loc
NWC203 - Course 2 - Peer-to-Peer Protocols and Loc
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NWC203 - Course 2 - Peer-to-Peer Protocols and Local Area
Networks
In networks where errors are infrequent, which approach is favored for efficiency?
Hop-by-hop approach
End-to-end approach
Either one of the above
Neither one of the above ✔️B
Which of the following statements is true about the stop-and-wait ARQ protocol?
Stop-and-wait is only efficient if the link delay-bandwidth product is small
Stop-and-wait is only efficient if the link bandwidth is low
Stop-and-wait is only efficient if the link delay-bandwidth product is large
Stop-and-wait is only efficient if the link bandwidth is high ✔️A
Consider a situation where an interactive application produces a packet to send each keystroke from the
client and the server echoes each keystroke that it receives from the client. Which of following
strategies for sending ACK frames in a Go-Back-N is appropriate for the situation?
Send an ACK frame immediately after each frame is received
Send an ACK frame after every other frame is received
Send an ACK frame when the next piggyback opportunity arises
Any one of the above ✔️C
Question 5
Consider Selective Repeat ARQ flow control protocol. In the following scenario, what should be the
value of frame number x at receiver B?
,3
2
4
None of the above ✔️C
ARQ protocols combine error detection, retransmission and sequence numbering to provide reliability
point
True
False ✔️A
A service model specifies a level of performance that can be expected in the transfer of information.
point
True
False ✔️A
A service offered at a given layer can include which of the following feature(s)
point
Sequencing
Reliability
Timing
All of the above ✔️D
Digital communication technologies may introduce errors in communication, which of the following can
be used to provide reliable communication
point
DNS
HDLC
TCP
UDP ✔️BC
, Ensuring that information is not altered during transfer is associated with
point
Availability
Integrity
Authentication
Confidentiality ✔️B
Consider a bulk data transfer application where a server sends a large file that is segmented in a number
of full-size packets that are to be transferred to the client. Assume the channel has a low probability of
error. Which of following strategies for sending ACK frames in a Go-Back-N is appropriate for the
situation?
2 points
send an ACK frame when the next piggyback opportunity arises
send an ACK frame immediately after each frame is received
send an ACK frame after every other frame is received
Any one of the above
5. ✔️
Given 3 bits for sequence numbers, what is the maximum sliding window size at the receiver in Go Back
3 ARQ?
points
3
7
8
None of the above
<hint: In go-back-N, the maximum number of frames that can be outstanding is 2^m - 1, where m is the
number of bits in sequence number.> ✔️B
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