14.2 Problem TCP slow start * We learned about the primary made of operation of TCP Reno, where cwnd increases by 1 for each RTT. Equivalently, cwnd increases by 1cwnd for each ACK received. This operational mode is called congestion avoidance. However, this results in linear increase of cwnd over time. At the beginning of a TCP connection, we should like to quickly ramp up cwnd before transitioning to congestion avoidance mode. Most TCP protocols have (somewhat confusingly named) slow start phase that accomplishes exactly this. In this mode, cwnd increases by 1 for each ACK received. If we plot cwnd versus time, instead of having a linear increase as in congestion avoidance, what is the rate of increase in slow start? Draw a space time diagram for the slow start phase, for 4 RTTs. Assume cwnd starts at 1.