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1. (1 pt) Under what conditions would an open-loop protocol
such as an error-correcting Hamming code be preferable to the feedback type
protocols discussed throughout this chapter?
2. (1 pt) Suppose that a stop-and-wait protocol was used on
a channel is 1 second propagation delay and sender frames of 5 seconds. The
receiver must fully receive the frame before sending an acknowledgment. The size
of the acknowledgment can be ignored. What is the channel utilization?
3. (1 pt) A channel has a propagation delay of 1
second. The receiver must fully receive the frame before sending an
acknowledgment. The size of the acknowledgment can be ignored. For what range of
frame sizes (in seconds) does stop-and-wait utilize at least 80% of the channel?
4. (4 pt) Using the below diagram, starting at 1 for each list the sender and receiver state numbers that would be entered given that:
Sender Receiver
5. (6 pt) Using p-persistent, consider 2 nodes - X and Y. If Y is
twice as likely to transmit as X, is its throughput twice that of X's? Why or
why not? Is it possible to create (mathematically) conditions that would
accomplish this?
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