Question $3.$ Two nodes $($A and B$)$ use sliding$-$window protocol with a $3-$bit sequence number. As the ARQ mechanism, Go$-$

Back$-$N is used with a window size of $4.$ Assuming A is transmitting and $B$ is receiving, show the window positions for the

following succession of events.

a$.$ Before a sends any frame.

b$.$ After A sends frames $0,1,2$ and $B$ acknowledges $0,1$ and the ACK are received by $A.$

c$.$ After A sends frames $3,4,5$ and B acknowledges $4$ and the ACK is received by A$.$