a Suppose that a stopandwait protocol was used on a channel

a. Suppose that a stop-and-wait protocol was used on a channel has a 10 millisecond propagation delay and sender frames sizes of 50 milliseconds. The receiver must fully receive the frame before sending an acknowledgment. The size of the acknowledgment can be ignored. What is the channel utilization?

b. 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 90% of the channel?

Solution

a. Channel utilisation is calculated based on the frame sizes milliseconds and propagation delay. Thus it will be 50-10=40.

b. For 100 range of frame sizes in seconds stop and wait utilise 90% of the channel.