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In question 8 , if the two stations use sliding window protocol with a window size of 8 0 , the maximum line efficiency will

In question 8, if the two stations use sliding window protocol with a
window size of 80, the maximum line efficiency will be up to:
(a)10%
(b)100%
(c)80%
(d)1
8.2
(a)
(b)
(c)
(d)
9) A communication link has a bit error rate BER=0.02. Using a
frame length of 800 bits, the probability of receiving a frame correctly
is given by:
(a)1
(b)0.2(c)1-(1-0.02)800
(d)(1-0.02)800
9
(a)
(b)
(c)
(d)
10) Two stations (A) and (B) use selective-reject ARQ to exchange
frames of 100 bits at a data rate of 10 Mbps. The two stations are
connected by a full duplex line 10 km long. Assume the velocity is 108
m/s and a BER=5x104.
The window size to achieve an efficiency of 80% is:
(a)18
(b)17
(c)17.68
(d)17.684
10.1(a)
(b)
(c)
(d)

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