The size of the window is 8 a packet with sequence number

Question

Problem

Answer the following questions related to the FSM's for the Selective-Repeat protocol with m = 7 bits (Figure 13.33):

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

b. The sending machine is in the ready state with S_f = 10 and S_n = 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 S_f = 10 and S_n = 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 S_f = 14 and S_n = 21. What is the size of the window?

e. The sending machine is in the blocking state with S_f = 14 and S_n = 21. An ACK with ackNo = 14 arrives. Packets 15 and 16 have been already 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 R_n = 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?

g. The receiving machine is in the ready state with R_n = 16. The size of the window is 8. A packet with sequence number 18 arrives. What is the next value of Rn? What is the response of the machine to this event?

h. The receiving machine is in the ready state with Rn = 16. The size of the window is 8. A packet with sequence number 18 arrives. What is the next value of R_n? What is the response of the machine to this event?