题目内容
Network operating systems (NOS) control and coordinate the activities of all computers and other devices on a network.
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WANs are widely used by organizations to link personal computers and to share printers and other resources.
A network gateway can be used to connect the LAN of one office group to the LAN of another office group.
The most common standard in LANs is called Ethernet.
A MAN is a network that is frequently used as links between office buildings that are located throughout a city.
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