SIEMENS 6GK7443-1EX11-0XE0
对于网络上的每1个节点，可能处于下述5种情况之一：
（1）在线联网运行，系统至少有2个节点在运行；（2）在线单机运行，系统只有本地节点在运行；（3）离线单机运行，此节点的网卡存在且正常、但没有上网；（4）离线单机运行，此节点的网卡存在，但出现故障；（5）离线单机运行，此节点不存在网卡。
目前的网络控制器都提供了命令、诊断、配置和状态寄存器，通过读写这些寄存器，便可以区分上述5种情况。当系统运行时，各种因素都可能存在，为了在线反映网络各节点的运行状态，每个节点可以设置一张网络状态表，记录各节点上每块网卡的运行状态。
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