Question 1 [5 points) a. List two major advantages and two major disadvantages with the layered approach to protocols. [2 points) b. List some of the major functions of each layer in the TCP/IP (Transmission Control Protocol/Internet Protocol) protocol architecture. [3 points) Question 2 [5 points) Suppose users share a 1 Mbps link. Also suppose each user requires 200 kbps when transmitting, but each user transmits only 60 percent of the time. a. When circuit switching is used, how many users can be supported? [1 point) b. Suppose there are 8 users and packet switching is employed. Find the probability that at any given, there are 6 or more users transmitting simultaneously. [3 points) c. Would a packet-switched network or a circuit-switched network be more appropriate for this application? Why? [1 point)