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

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

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Computer Networking
TCP is:

Operates at the Data Link layer
Connection orientated and reliable
None of these
Connectionless and unreliable
Connection orientated and unreliable

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