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Cloud computing is a phrase used to desc

练习题库2022-08-02  60
问题 Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers（ ） through a real-time communication network such as the Internet. Inscience, cloud computing is a （ ）for distributed computing over a network, and means the （ ） to run a program or application on many connected computers at the same time.The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastucture layer is built with virtualized computestorageand network resources. The platform lay-er is for general-purpose and repeated usage of the collection of software resources. The application layer is formed with a collection of all needed software modules for SaaS applications. The infrastucture layer servesas the（ ） for building the platform layer of the cloud. In turn, the platform layer is founda-tion for implementing the （请作答此空）layer for SaaS applicationA.resourceB.serviceC.applicationD.software
选项 A.resource
B.service
C.application
D.software
答案 C
解析 云计算是一个用来描述各种计算概念的一个短语，计算概念涉及大量计算机通过实时通信的网络，如Internet，（ ）在一起。在科学研究中，云计算是分布式网络计算的（），意味着有（ ）同时在多台互连的计算机上运行一个程序或应用。

云的结构分为3层：基础设施、平台和应用。基础实施层由虚拟计算机存储和网络资源构成；平台层是具有通用性和复用性的软件资源的集合；应用层是云上针对SaaS应用的所有应用软件的集合。基础设施层时建立平台层的（ ）基础；相应地，平台层是执行应用层SaaS（请作答此空）的基础。

A．资源                  B．服务                  C．应用               D．软件
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