2. 计算机
  3. There are common cloud computing service models.______ usually requires companies to deploy their own operating systems, applica

There are common cloud computing service models.______ usually requires companies to deploy their own operating systems, applica

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问题 There are common cloud computing service models.______ usually requires companies to deploy their own operating systems, applications, and software onto the provided infrastructure.______is the software environment that runs on top of the infrastructure. In the ______model the provider commonly gives the customers network-based access to a single copy of an application.
选项 A、Platform as a Service, Infrastructure as a Service, Software as a Service
B、Platform as a Service, Platform as Software, Application as a Service
C、Infrastructure as a Service, Application as a Service, Software as a Service
D、Infrastructure as a Service, Platform as Software, Software as a Service
答案D
解析 D正确。最常见的云服务模型是基础设施即服务(Infrastructure as a Service，IaaS)、平台即服务(Platform as a Service，PaaS)和软件即服务(Software as aService，SaaS)。
A不正确。因为这些项的排序是不正确的。基础设施即服务(IaaS)是云提供商以按需交付的方式，为传统数据中心提供的基础设施环境。公司在所提供的基础设施上使用他们自己的操作系统、应用程序和软件，并负责维护它们。
B不正确。因为最常见的云服务模型是基础设施即服务(IaaS)、平台即服务(PaaS)和软件即服务(SaaS)。并不存在平台即软件(Platform as Software)或应用程序即服务(Application as a Service)的模型。这些都是干扰项。平台即服务(PaaS)是云提供商交付的一种计算平台，这个平台可以包括操作系统、数据库和Web服务器作为整体运行环境。IaaS是“原始IT网络”，而PaaS是运行在IT网络顶层的软件环境。
C不正确。因为最常见的云服务模型是基础设施即服务(IaaS)、平台即服务(PaaS)和软件即服务(SaaS)。并不存在平台即软件(Platform as a Software)的模型。提供商使用软件即服务(SaaS)，就能授予用户访问特定应用程序(CRM、电子邮件、游戏)的访问权限。供应商向客户提供对专门为SaaS分发和使用而创建的应用程序的单拷贝的基于网络的访问。
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