Selective-Reject ARQ Systems
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Consider a selective-reject ARQ system with a window size of 3.
a) Circle (or shade or bold) the sender window after frames 0 through 3 have been sent and ACK 2 has been received
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
b) Circle (or shade or bold) the sender windows after frames 4 through 6 have been transmitted, ACK 5 and NAK 5 are received.
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
c) After a) and b) have occurred, which frames need to be resent?
d) After a) and b) have occurred, which frames have been acknowledged?
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This job emphasizes a selective-reject ARQ system with a window size of 3.
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[2] Consider a selective- reject ARQ
Posting
Consider a selective-reject ARQ system with a window size of 3.
=============================================
a) Circle (or shade or bold) the sender window after frames 0 through 3 have been sent and ACK 2 has been received
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
=================================================
Window [0,2] [3-5]
SN
Node A
Node B
RN
Packets
Delivered 0 1 2
b) Circle (or shade or bold) the sender windows after frames 4 through 6 have been transmitted, ACK 5 and NAK 5 are received.
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
Window [4,6] [5,7]
SN
Node A
Node B
RN
Packets
Delivered 4
c) After a) and b) have occurred, which frames need to be resent?
5,6,7
d) After a) and b) ...
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- MEngSc, University of Melbourne
- Certificate IV in Training & Assessment , Australian Business Council
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