Data communication:

Two neighboring nodes (A and B) are using a sliding window protocol with 3-bit sequence numbers. As the ARQ mechanism, GO-Back- N is used. Assuming A is transmitting, and B is receiving, show the window position for the following succession of events:

a) Before A sends any frames

b) After A sends frames 0,1,2,3 and B acknowledges 0,1 and the ACKs are received by A.

c) After A sends 4,5,6 and B acknowledges 4.

Hint: First find the window size