VI Private vs Public Networks
A private network is one in which all devices on the network and all links between those devices are used and administratively controlled by a single organization; whereas a public network is one where network connectivity and resources are shared by many different administrative units.
Network infrastructures, particularly for large-scale wide area networks, are expensive to build and maintain. Organizations can choose to shoulder all of this expense themselves, or to share it with other users who also need similar networking facilities.
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