4. Suppose you want to send a total of 100 1500byte packets to your friend and they want to do the same (send 100 1500byte packets to you). You generate 1 packet every 20ms, and your friend also generates new packets at the same rate (1 packet every 20ms). Luckily, you establish a circuit switched connection with your friend before they can, and tear down the connection only after you are done with your transmission. The network supports a single unidirectional connection at one time. How long will it take for your friend's last 1 packet to reach you? Assume connection setup time is 5ms, but connection tear down is instantaneous after the last packet is delivered. 5. Now, you decide to change to a packet switched network instead. When will the last bit be exchanged between you and your friend? All links are unidirectional at one time