课程名称︰云端运算概论 课程性质︰云端计算趋势学程必修 课程教师︰刘邦锋 开课学院：电资院 开课系所︰资讯系 考试日期（年月日）︰101.11/08 考试时限（分钟）：180 mins (18:30 ~ 21:30) 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : Answer the following questions. (70%) 1. What are the necessary conditions for setting up a data center at a parti- cular location? Explain your answers. 2. What is auto scaling? How does it benefit business which use cloud service to build web services? 3. Recently in Taiwan there is a debate on the 3G pricing policy - whether we should have 「pay-for-what-you-use」 or 「all-you-can-eat」. Describe the effects of these two different policies on quality of services. 4. Why does cloud computing use a 「shared pool」 of resource model? 5. Why Google file system put all metadata into memory? If this feature is that good, why was it not done before? 6. Describe and compare full virtualization and paravirtualization. 7. Draw a figure of Hadoop system architecture, and explain the function of each component. Choice the most appropriate answer. 3 points will be given for each correct answer, and 1 point will be deducted for each wrong answer. (30%) 1. In the Berkeley paper one obstacle is data transfer bottleneck, which means it is time and money consuming to transfer data between a. Cloud service provider and cloud users. b. Different zones of the same cloud service provider. c. Cloud users and cloud users. d. Different cloud service providers. 2. In the virtualization laboratory, we do the following. a. Run a Windows vitual machine on a linux host, then run a Android virtual machine on the Windows. b. Run a Linux vitual machine on a Windows host, then run a Android virtual machine on the Windows. c. Run a Linux vitual machine on a Windows host, then run a Android virtual machine on the Linux. d. Run an Android vitual machine on a Windows host, then run a linux virtual machine on the Android. 3. The hot aisle is usually located at? a. Infront of the machine b. Behind the machine c. Under the machine d. Above the machine 4. What will happen if the namenodes of a Hadoop system crash? a. You can list a directory but cannot retrieve the contents. b. You cannot list the directory. c. Nothing will happen since the files are backup in three places. d. It depends on the arrangement of datanodes. 5. Why do we need virtualization in cloud computing? a. NFS file system is not scalable. b. To improve computation performance. c. To reduce network latency. d. Applications are difficult to deploy. 6. What does this command do? hadoop dfs -put file1 file2 a. Copy a local file to Hadoop file system. b. Copy a Hadoop file to local file system. c. Copy a local file to local file system. d. Copy a Hadoop file to Hadoop file system. 7. Suppose a file has only one block and the replication factor is 3. Accor- ding to Hadoop replication mechanixm one replica must be placed at the same rack, and one replica must not be placed at the same rack, then what is the number of racks that we need to shutdown in order to make this file unavai- lable? a. 1 b. 2 c. 3 d. 4 8. What of the following is NOT a functionality of a cloud OS? a. To start virtual machines. b. To compute the costs of services provided. c. To manage virtual machine images. d. To manage the contents of the web services for the cloud users. 9. The cold air in our CSIE machine room is coming from. a. The floor. b. The ceiling. c. The wall outlet. d. The rack. 10. Amazon EC2 is an example of a. IaaS. b. PaaS. c. SaaS. d. NaaS. --

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