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Category > Computer Science Posted 13 Jul 2017 My Price 6.00

Repeat protocol


Answer the following questions related to the FSMs for the Selective-Repeat protocol with m = 7 bits. Assume the window size is 64. (Figure 23.34):

 

a. The sending machine is in the ready state with Sf  = 10 and Sn = 15. What is the sequence number of the next packet to send?

b. The sending machine is in the ready state with Sf = 10 and Sn = 15. The timer for packet 10 times out. How many packets are to be resent? What are their sequence numbers?

c. The sending machine is in the ready state with Sf = 10 and Sn = 15. An ACK with ackNo = 13 arrives. What are the next values of Sf  and Sn? What is the action in response to this event?

d. The sending machine is in the blocking state with Sf = 14 and Sn = 21.

What is the size of the window?

e. The sending machine is in the blocking state with Sf  = 14 and Sn = 21. An ACK with ackNo = 14 arrives. Packets 15 and 16 have already been acknowledged. What are the next values of Sf  and Sn? What is the state of the sending machine?

f. The receiving machine is in the ready state with Rn = 16. The size of the window is 8. A packet with sequence number 16 arrives. What is the next value of Rn? What is the response of the machine to this event?

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Maurice Tutor
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Status NEW Posted 13 Jul 2017 10:07 PM My Price 6.00

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