Suppose four nodes, A, B, C, and D, are all connected to a hub via 10Mbps Ethernet cables. The distances between the hub and the 'e four nodes are 300m, 400111, 500m, and 700m, respectively. Recall that the CSMNCD protocol is used for this Ethernet. Assume that the signal propagation speed is 2 . 108 sec.
a. What is the minimum required frame length? What is the maximum required frame length?
b. [I' all frames are 1500 bits long, find the efficiency of this Ethernet.