Lab/Tutorial :
1) ARQ Control Scheme
Fill in the name of frame being transmitted
SEHH2238 : Computer Networking Session 4 : Data Link Control
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(a) Error Free (i)_____________
Primary I(N)
(b) Loss ACK (i)__________
Primary I(N)
2) Stop-and-Wait ARQ
(ii)______________
(iii) ______________
(iii) ___________ (ii)
(ii) ___________
(iv) ____________ (iv)
A system uses the Stop-and Wait ARQ Protocol. If each frame carries 1000 bits of data, how long does it take to send 1 million bits of data if the distance between the sender and receiver is 5000 km and the propagation speed is 2 x 108 ms-1? Assume the channel data rate is 1 Mbps and ignore processing delays and ACK transmission time. Further assume that no data or control frame is lost or damaged. Also ignore the overhead due to the header and trailer.
Continue from the previous question. Further assume that there is a data frame lost in every 10 data frames sent. Sender retransmits the lost frame after a timeout of 100 ms. How long does it take to send 1 million bits of data?
3) Bit Stuffing
1. Bit stuff the following data 000111111100111110100011111111111000011111
What should be the content of the data frame to be sent? (Ignoring the header and trailer)
SEHH2238 Computer Networking Tutorial 4 Page 1
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