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2. Station B receives all three frames and cumulatively acknowledges with RR 3. 3. Because of a noise burst, the RR 3 is lost. 4. A times out and retransmits frame 0. 5. B has already advanced its receive window to accept frames 3, 0, 1, 2. Thus it assumes that frame 3 has been lost and that this is a new frame 0, which it accepts. 2P) SREJ (7) SREJ (127) 1–P 1–P 1. 10 100 (1 – P)/3 (1 – P)/21 (1 – P)/201 (1–P)/(1+2P) 7(1–P)/21(1+6P 7(1 – P)/201(1+6P) ) (1–P)/(1+2P) (1 – P)/(1+20P) 127(1–P)/201(1+126P ) 1–P 7(1 – P)/21 7(1 – P)/201 1–P 1–P 127(1 – P)/201 For a given value of a, the utilization values change very little as a function of P over a reasonable range (say 10-3 to 10-12).

1 The bandwidth is wider after the signal has been encoded using spread spectrum. 2 (1) We can gain immunity from various kinds of noise and multipath distortion. (2) It can also be used for hiding and encrypting signals. Only a recipient who knows the spreading code can recover the encoded information. (3) Several users can independently use the same higher bandwidth with very little interference, using code division multiple access (CDMA). 3 With frequency hopping spread spectrum (FHSS), the signal is broadcast over a seemingly random series of radio frequencies, hopping from frequency to frequency at fixed intervals.

6 In the datagram approach, each packet is treated independently, with no reference to packets that have gone before. In the virtual circuit approach, a preplanned route is established before any packets are sent. Once the route is established, all the packets between a pair of communicating parties follow this same route through the network. 7 There is a significant relationship between packet size and transmission time. 14. 14d. 8 Transmission, processing, and queuing delays. 25. 25 uses all in-channel control.

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Data and Computer Communications, 7th Edition, Solutions Manual by WILLIAM STALLINGS

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