Question 3 (25 points): For each of the following networks, assume node A transmits a stream of 1kB packets to node C through B. 1) Which network will have queueing delay in node B? Justify your answer. 2) Draw a sequence diagram for each illustrating transferring a stream of packets over time from A to B to C. 3) If we ignore queueing delay, how long it will take to transfer 1MB file divided into 1KB packets from A to C ? 4) If both links in the first network are upgraded to 1Gbps, how long would it take to transfer the 1 MB file