Q,.4. Fixed size messages of 100 bits are generated by an application and transm

Question

Q,.4. Fixed size messages of 100 bits are generated by an application and transmitted with a reliable transmission service. The sizes of headers and acknowledgements of the reliable transmission layer (RTL) are negligible. The data packets are generated only on the sender side. The transmission rate of the sender is 100Kbits/sec. The round trip time between sender and receiver is 19msec. Time out is selected to be 29msec.The time out period begins after the last bit of a data packet is transmitted. The receiver is a powerful machine with enough amount of buffer memory (a) Assume that the sender has a buffer of only 100bits. It is observed that the probability of a successful transmission of the data packet and the corresponding ACK is 0.75. What is the average data rate provided to the application? (b) Assume that now the sender has a buffer of 3200 bits. The probability of a successful transmission of the data packet and the corresponding ACK is 0.75 for reliable transmission. i. How many bits of sequence numbers is required to support the correct operation? Time out 29 10o l Sec look bi RTT 14 msea L-0.75 time out 24 msec 10o g bit dota lates bt sec I-L

Explanation / Answer

Hello,

Please find solution

              Rate=100K bits/sec

              Time out= 29msec

Buffer=100 bits

ACK=0.75

Avg Data Rate= 0.75*rate

=0.75*100/100*1000 K bits/sec

=75 K bits/sec

2 a.Throughput= 3200*1000/75

                    = 42.66 m sec

b. 32 bits of sequence number is required

Thanks

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