List (and explain in one or two sentences each) three items from the two assigned papers that were not considered in the original design of the Internet, but which became important concerns later.

1. The congestion avoidance method in this paper increases the congestion window (cwnd) by 1/cwnd on each arriving ACK. Explain why this method increases cwnd linearly in time.

2. This paper describes a congestion control scheme where packet losses are the only explicit signal that congestion has occurred. When a queue is full and a packet arrives at a router ("gateway"), suppose the router can drop either the arriving packet, or a packet at the very front of the queue. Which approach would you choose, and why?

3. If a router never drops packets, what happens to the delays experienced by packets?