(a): When a party makes a local telephone call to another party, is this a point-to-point or multipoint connection? Explain your answer. (b): Assume six devices are arranged in a mesh topology. How many cables are needed? How many ports are needed for each device? (c): For each of the following four networks, discuss the consequences if a connection fails. a. Five devices arranged in a mesh topology b. Five devices arranged in a star topology (not counting the hub) c. Five devices arranged in a bus topology d. Five devices arranged in a ring topology Q.2 (Unit-2) (a) What are headers and trailers, and how do they get added and removed? (b) How do the layers of the Internet model correlate to the layers of the OSI model? Session 2022-2023 / Sem-2 (c) What is the difference between a port address, a logical address, and a physical address? Q.3 (Unit-3) (a) The period of a signal is 100 ms. What is its frequency in kilohertz? (b) If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700 , and 900Hz, what is its bandwidth? Draw the spectrum, assuming all components have a maximum amplitude of 10V. (c) The power of a signal is 10mW and the power of the noise is 1/1W; what are the values of SNR and SNRdB