This module could alert administrator and cut off the network link to the abnormal host automatically.
该模块可以对管理员实施报警，并且可以自动断开异常主机的网络连接。
The Link Layer is the networking scope of the local network connection to which a host is attached.
链路层是指本地网络到每一台被连接主机的网络范围。
Network hosts the network to link up later, when a heavy burden on the host, the network may be part of the task handed over to the network to deal with than the free host.
网络中的各台主机通过网络连接起来后，当某台主机负担过重时，网络可将它的部分任务转交网络中较空闲的主机处理。
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