It is responsible for active network discovery, polling for device outages and services, and intercepting or processing asynchronous events from devices, services, or higher level distributed agents.

第一层负责发现活动网络，轮询服务和设备是否出故障，以及截获或处理来自设备、服务或更高层分布式代理的异步事件。

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Specifying an application domain does not prevent management software from polling device-level metrics such as device load, CPU utilization, memory metrics, and environmental statistics.

指定应用程序域并不能防止管理软件轮询设备级指标，如设备加载、CPU 利用、内存指标以及环境统计数据。

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Depending on the environment, the device agent may poll for waiting jobs at a polling interval, or whenever the device is powered on, or both.

设备代理可以在轮流检测的间隔或设备启动后的任何时刻(或两种条件同时满足)查询等待执行的作业，这依赖于所处的环境。

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