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Tricky Network Security
Q
A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 250 frames per second?
AA. 38 frames
BB. 48 frames
CC. 96 frames
DD. 126 frames
Correct Answer:
A. A. 38 frames
Explanation:
If the system creates 250 frames per second, or 1/4 frames per millisecond, then G = ¼. S = G × e−2G = 0.152 (15.2 percent). This means that Throughput = 250 × 0.152 = 38. Only 38 frames out of 250 will probably survive.
