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Lecture02 Review Questions 辨析WLAN、IEEE 802.11与WiFi三个概念的关系.pptx

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Lecture02 Review Questions 辨析WLAN、IEEE 802.11与WiFi三个概念的关系.pptx Powered By Docstoc
					   Lecture02 Review Questions
1. 辨析WLAN、IEEE 802.11与WiFi三个概念的
   关系
2. 什么是LTE?
Key points:
Q1: WLAN 是无线局域网,802.11是WLAN的一个技术标准,
    WiFi是符合一定互操作规范的802.11技术/产品。
Q2:LTE是3GPP提出的一个移动通信技术标准,一般认为是
    4G,但不完全符合ITU对4G的要求。



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  Lecture03 Review Questions
1. 计算模型有什么用?
Key points:
计算模型是对系统和环境的抽象描述和界定,可以
1)帮助理解计算系统的结构、工作模式和实现技术;
2)用于指导计算系统的设计、实现以及相关应用的开发。
     Lecture04 Homework Questions
1. In Wong’s data broadcast algorithm, why is the ratio fi/fj
   required to be        ?
A. To achieve (theoretically) optimal access time.
   Access time at =              , where T is the broadcast period, i.e.
   T=       . Then, at gets the minimum value with .
2. In the indexing example with 243 items, what will happen if a user
   wants to access item 65 with initial probe at data bucket 3 or
   index bucket b1 respectively?
A.   Initial at data 3: data 3, pointing to second a1, b3, c8, d22 and data bucket for
     item 65.
     Initial at b1: b1 second a1, b3, c8, d22 and data bucket for item 65.
3.   In the tree-based index replication, tuning for item 27 when first
     probe is at bucket d1, what will happen if both buckets d1 and c2
     are corrupted?
A.   d1, data bucket under d1, d2, d3, c2, d4, d5, d6, c3, d9, bucket containing 27.

				
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