星期日, 11月 11, 2007

11-10-2007 Homework

In the talk, we introduced the evolution of contention based protocols:
1. ALOHA
2. CSMA (Carrier Sense Multiple Access)
3. CSMA/CD (collision detection) -> IEEE 802.3 (Ethernet, 100M, 1Gbps)

Problems:

1. Why does Pure Aloha perform worse than Slotted Aloha?

2. According to Textbook pp. 2-48~2-51, why does 1-persistent CSMA have lower throughput than non-persistent CSMA when generated traffic rate is higher than 1 (G>1)? Why does 1-persistent CSMA have shorter latency than non-persistent CSMA?

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  1. 電子碩專二 余怡璇
    Homework 11/10/2007

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