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。
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.
这些工具通过UDP使用SNMP来为SNMP代理轮询设备和应用程序指标。
These tools use SNMP over UDP to poll an SNMP agent for device and application metrics.
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。
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.
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