报文认证代码 MAC Message authentication code 城域网 MAN Metropolitan area networks 管理服务器 Management Server? ?
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A new technology called Optical Ethernet is beginning to revolutionize metropolitan-area networks (MAN).
一项叫做光以太网的新技术开始使城域网(MAN)发生变革。
Now, Gigabit Ethernet is being used in some metropolitan-area networks (MAN), and standards bodies are readying 10-Gigabit Ethernet for metropolitan and even WANs.
现在，千兆位以太网已用于一些城域网（man），标准机构正在为大城市网、甚至广域网制定10千。
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