Define the following parameters for a switching network: N = number of hops between two given end systems L = message length in bits B = data rate, in bits per second (bps), on all links P = fixed packet size, in bits H= overhead (header) bits per packet S = call setup time (circuit switching or virtual circuit) in seconds D = propagation delay per hop in seconds a. For N = 4, L = 3200, B = 9600, = 1024, H = 16, S = 0.2, D = 0.001, compute the end-to-end delay for circuit switching, virtual circuit packet switching, and datagram packet switching. Assume that there are no acknowledgments. Ignore processing delay at the nodes