Compare and contrast the different short range data link layer technologies (rfid, wifi, bluetooth and zigbee/6lowpan) in terms of communication range, power consumption, battery life and data rates 1. 2. what are the two models of communication adapted to support m2m communications and what protocols are typically used for the exchange of m2m data? describe their differences. 3. in cdn management, what is the difference between a "server selection policy" and a "server selection mechanism" 4. what is the server placement strategy adopted by netflix for its cdn? how is content replicated at the different servers? in video streaming applications, why is http streaming more popular than udp streaming? 5. 6. consider the simple model for http streaming. suppose the server sends bits at a constant rate of 2 mbps and playback begins when 8 million bits have been received. what is the initial buffering delay t,? 7. consider the figure below. suppose that video is encoded at a fixed bit rate, and thus each video block contains video frames that are to be played out over the same fixed amount of time, a. the server transmits the first video block at t, the second block at t, + a, the third block at t, + 2a, and so on. once the client begins playout, each block should be played out a time units after the previous block