Please, answer the following questions: Each calculated expression and a brief description of each element in the calculation are needed. Solutions limited to final numerical values will not be considered correct.
a) There is one packet switch between two hosts, the first link has a rate of 1 Mbps and the second link has a rate of 2 Mbps. Assume there is no other traffic on this network, the processing delays are negligible. If every packet has size 64 bytes, what is the time needed to transfer 40 packets between these two hosts? What is the expected queuing delay at the output buffer of the packet switch?
b) Suppose there is a 10 Mbps microwave link between two base stations on Earth connected through a geostationary satellite. Every minute the satellite takes a grayscale image, where each pixel takes 8 bits, then sends it to the base station. If the propagation speed is 2.4 times 108 m/s. What is the propagation delay of the link? If the image is square, what is the minimum size of this image in pixels for the link to be continuously transmitting?