26) In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM

27) If a network designer wants to connect 5 routers as point-to-point simplex line, then total number of lines required would be

28) To interface a computer terminal with a modem, required physical layer standard is

29) A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable

30) How much bandwidth is there in 0.1 micron of spectrum at a wavelength of 1 micron ?