## Consider a 250-meter link, over which a sender can transmit at a rate of 50,000

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Consider a 250-meter link, over which a sender can transmit at a rate of 50,000 bits/sec in each direction. Assume  The packets containing data (HTTP objects) are 100,000 bits long and contain one object.  The packets containing only control information (like ACKs and requests) are only 12,500 bits long.  That a request is made for a particular webpage. The initial response to that request is a single object (an HTML file). While processing that single object 23 additional objects are requested.  After an object has been completely received, the receiving host can begin creating the next non-persistent connection at the same time it is closing the present nonpersistent connection.  Separate ACKs are always sent (no piggybacking) Consider how long it would take to obtain all 23 of these objects in each of the following scenarios. a) [6 points]Assume that each object is requested using a non-persistent HTTP connection. Each non-persistent connection is used to transport one object. b) [8 points]Assume that the first object is requested using a non-persistent HTTP connection. Then consider the remaining 23 objects requested by the first object. The bandwidth of the medium will be divided into 5 equal channels each with 1/5 of the bandwidth (a transmission rate of 10,000 bps in each of the 5 channels). Simultaneously, one object can be transmitted in each channel. c) [6 points] Assume a single persistent HTTP connection is used for all 23 objects.

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#065

## Consider the following communication scenario: a sender A transmits its data to

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Consider the following communication scenario: a sender A transmits its data to a receiver B over a communication channel composed of two point-to-point links. The first link connects A to a router C, whereas the second link connects C to B. The channel parameters for the first link are: transmission bit rate  The channel parameters for the second link are: transmission bit rate  0.0005. The propagation delay is constant and equal for the two links, τp = 50. The size of acknowledgment messages is A = 500 bits. a) Assuming that two independent SW-ARQ protocols are used to assure an error free communication over the two links, compute the maximum achievable normalized throughput   over each of the two links (A → C and C → B). b) Compute the maximum transmission bit-rate, Bmax, from A → B that can be supported by the two ARQ protocols working in sequence.
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#065

## Consider a sender A that communicates over a wireless channel to a receiver B us

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Consider a sender A that communicates over a wireless channel to a receiver B using SR-ARQ. The round-trip time, intended as the time from the beginning of the transmission of a PDU at terminal A to the complete reception of the corresponding ACK at terminal B is RTT = 500 ms. The transmission bit rate is Rb = 1 Mbit/s. The size of PDU headers and payloads is respectively LO = 100 bits and LD = 4900 bits. The window size of the SR-ARQ protocol is W = 50 PDUs and the channel has a bit error probability of Pbit = 10−4. a) Compute the normalized throughput S of the given SR-ARQ. b) Compute a new window size so that the channel pipe is entirely filled with transmitted PDUs and compute the normalized throughput for this case.
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