Problem 1: In the figure below frames are generated at node A and sent to node C through node B. Determine the minimum transmission rate required between nodes B and C so that the buffers of node B are not flooded, based on the following: The data rate between A and B is 100 kbps . The propagation delay is 5 sec/km for both lines There are full-duplex lines between the nodes . All data frames are 1000 bits long; ACK frames are separate frames of negligible length. .Between A and B, a sliding-window protocol with a window size of 3 is used. . Between B and C, stop-and-wait is used. .There are no errors. Hint: In order not to flood the buffers of B, the average number of frames entering and leaving B must be the same over a long interval. 1000 Km 4000 Km