70) In which routing method do all the routers have a common database

71) A terminal multiplexer has six 1200 bps terminals and (rf 300 bps terminals connected to it. The outgoing line is 9600 bps. What is the maximum value of n

72) Data link layer retransmits the damaged frames in most networks. If probability of a frame's being damaged is p, then what is the mean number of transmissions required to send a frame if acknowledgements are never lost ?

73) If a designer wants to design a point-to-point sub-network with 10 routers of full duplex line, then total number of lines among them would be

74) Maximum data rate of a noiseless 4 kHz channel using T1 PCM system is