a) Consider standard TCP (with slow-start, fast retransmission, but no fast recovery). Draw a plot of the congestion window over time. The congestion window is the vertical axis and time the horizontal axis. Assume the source always has data to send, and is only limited by the congestion window. The plot begins when the TCP sends its first data message, and should be long enough to include several times when TCP detects congestion. b) Same as (a) above, except that fast-recovery is also used. c) Assume the source performs fast retransmission for packet X. How long does it take from the time the source sends packet X until it performs the retransmission of X? Explain BRIEFLY why. d) For (c) above, assume we DO NOT perform fast recovery. How many packets of the source (data or ack) are in the network when the source finally receives an ack for the retransmitted packet X? Explain BRIEFLY why