1. For each of the following TCP algorithms, write one sentence
explaining how it works, and another sentence describing what it is
for:

(a) delayed acknowledgements
(b) Nagle algorithm
(c) slow start
(d) fast retransmit
(e) congestion avoidance (fast recovery)
(f) Karn's algorithm

2. What are the benefits and drawbacks of keepalives?  Why does the
original TCP specification not include keepalives?

3. Why does a host running TCP include an ackowledgement with every
packet it sends, even if it has not received any new data?

4. What is the difference between the receive window and the
congestion window in TCP?

5. Give two reasons why it is a good idea for a host to piggyback
acknowledgements for received data along with the data it sends.