Question 2. This question concerns transport layer protocols. a. Suppose you have a video streaming application over a mobile wireless link. Would you use TCP or UDP? Briefly explain your choice. b. Why does network congestion lead to dropped packets in wired networks? c. Using TCP, suppose the initial window size is 1, and the congestion threshold is 32. Assuming all packets are acknowledged, give an example showing how the window size evolves up to and beyond the threshold. d. Repeat part b, assuming a packet in the third window is not acknowledged, and TCP enters slow start. In your example, illustrate all relevant features of TCP. e. In a wired network, packet loss is usually caused by congestion, but in a wireless network, packet loss is often caused by momentary fading. Explain why slow start leads to poor performance in wireless networks