Computer Networking
OSI model means:

Operating source interconnection
Open systems interconnection
Operating system interconnection
Open source interconnection

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
All of these
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received
the virtual circuit interface to packet-switched service

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