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Which is at the bottom of the OSI reference model（）
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In the OSI reference model, the first bottom-up level to provide end-to-end services is（）
A system that uses various means of communication to organically connect geographically dispersed autonomous computers to realize mutual communication and share hardware, software and data resources i
ARPANET is the predecessor of the Internet. It is a（）
If the network topology is a “closed loop” which composed of the site and the link connecting the site, then the topology is called（）
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