Windows Azure 名词定义（Glossary）

Glossary（名词）	Definition（定义）
Availability Set 可用性组	refers to two or more Virtual Machines deployed across different Fault Domains to avoid a single point of failure. 指为避免单点故障而在不同故障域部署的两台或更多虚拟机。
Cloud Services 云计算服务	refers to a set of compute resources utilized for Web and Worker Roles. 指用于 Web 角色和 Worker 角色的一套计算资源。
Web Role Web 角色	is a Cloud Services component run in the Windows Azure execution environment that is customized for web application programming as supported by IIS and ASP.NET. 指在 Windows Azure 执行环境中运行的云计算服务组件，它针对 Web 应用程序编程而定制，受 IIS 和 ASP.NET 支持。
Worker Role Worker 角色	is a Cloud Services component run in the Windows Azure execution environment that is useful for generalized development, and may perform background processing for a Web Role. 指在 Windows Azure 执行环境中运行的云计算服务组件，它对于一般性的开发很有用，并可能为 Web 角色执行后台处理任务。
External Connectivity 外部连通性	is bi-directional network traffic over supported protocols such as UDP and TCP that can be sent and received from a public IP address. 指可使用支持的协议（如 UDP 和 TCP）通过公共 IP 地址发送和接收的双向网络流量。
Fault Domain 故障域	is a collection of servers that share common resources such as power and network connectivity. 指共享公共资源（如电源和网络连接）的一组服务器。
Update Domain 更新域	refers to a set of Windows Azure instances to which platform updates are concurrently applied. 指一组 Windows Azure 实例，将同时对这些实例应用平台更新。
Service/Services 服务	refers to the Windows Azure Cloud Services, Virtual Machines, and Virtual Network provided to Customer pursuant to the Agreement. 指根据协议提供给客户的 Windows Azure 云计算服务、虚拟机和虚拟网络。
Tenant 租户	represents one or more roles each consisting of one or more role instances that are deployed in a single package. 指一个或多个角色，每个角色由在单个包中部署的一个或多个角色实例组成。
Virtual Machine 虚拟机	refers to persistent instance types that can be deployed individually or as part of an Availability Set. 指可单独部署或作为可用性组的一部分进行部署的持久化实例类型。
Virtual Network 虚拟网络	is a service supported by Windows Azure that enables customers to extend their corporate network to the cloud. The Virtual Network service consists of two parts: a VNet and a Virtual Network Gateway. 指 Windows Azure 支持的一项服务，客户能够利用该服务将企业网络扩展到云。虚拟网络服务由两部分组成：VNet 和虚拟网络网关。
Virtual Network Gateway 虚拟网络网关	refers to a Windows Azure service that facilitates cross-premises connectivity between one Virtual Network and one customer on-premises network over IPsec VPN. 指 Windows Azure 的一项服务，它能够通过 IPsec VPN 提供一个虚拟网络与一个客户本地网络之间的远程连通性。
VNet	refers to a virtual private network consisting of a collection of user-defined IP addresses and subnets that form a network boundary within Windows Azure. VNets support IP addresses as defined in RFC 1918. 指虚拟专用网络，它由一组用户自定义的 IP 地址和子网组成，从而构成 Windows Azure 的网络边界。VNet 支持 RFC 1918 中定义的 IP 地址。