(1.18) Which of following multiplexing te which of following multiplexing technique transmit gawignals FOM (b) SOM (c). TOM (d). WOM None of the Above (1.19) Which of following multiplexing technique yields the best resource utilization? (a). COM (b). FDM (c). TDM (d). WDM All of the above (1.20) The largest portion of the bandwidth for ADSL carries (a). (c). Voice communication Upstream data Control data Downstream data All of the above (d). (e). 2. (20 points) Briefly answer the following questions. (2.1) (5 points) What are two reasons for using layered protocols? What is one possible disadvantage of using layer protocols? (2.2) (5 points) Explain why communication systems use twisted pair wiring? (2.3) (5 points) True or False: In general, HTTP is built over TCP/IP and HTTP packets always follow the same route from a sender to a receiver? Justify your answer. (2.4) (5 points) Assume you just moved at very large apartment complex, and all of your neighbors are connected to the Internet by either DSL or cable modem. Now, you have a choice between DSL and cable modem for your internet connection. Which would provide the highest potential data rate? Why