Two neighboring nodes A and B use a sliding window protocol with a $3-$bit sequence number.

Selective repeat protocol is used with a window size of $4.$ Assume that A is transmitting and B is

receiving. For the following succession of events, show the window positions for A and B and

indicate the sequence number of packets delivered to B$$s network layer:

a$.$ Before A sends any frame.

b$.$ After A sends frames $0,1,$ and receives acknowledgements from B for $0$ and $1.$

c$.$ After A sends frames $3,4$ and $5$ and B sends acknowledgement for $5$ and ACK$5$ is

received by A$.$

d$.$ After A sends frames $6,7$ and $0$ and B sends acknowledgement for $7$ but ACK$7$ is not

received by A$.$

Clearly indicate what will happen after d$).$