QUESTIONS Review Questions Q.1. Which of the three multiplexing techniques is (are) used to combine analog signals? Which of the three multiplexing techniques is (are) used to combine digital signals? the hierarchy? Q.3. Define the digital hierarchy used by telephone companies and list different levels of fine the analog hierarchy used by telephone companies and list different levels of the hierarchy? Q.4. Distinguish between multilevel TDM, multiple slot TDM, and pulse-stuffed TDM Problens Q.5 Assume that a voice channel occupies a bandwidth of 4 KHz. We need to multiplex 10 voice channels with guard bands of 500 Hz using FDM. Calculate the required bandwidth Q.6. Suppose a computer sends a frame to another computer on a bus topology LAN. The physical destination address of the frame is corrupted during the transmission. What happens to the frame? How can the sender be informed about the situation? Q.7. Suppose a computer sends a packet at the transport layer to another computer some where in the internet. There is no process with the destination port address running at the destination computer. What will happen