Computer Networking
Which of the followings is used in communications is referred to as unshielded twisted-pair (UTP)?

Coaxial cable
None of these
Twisted-pair cable
Fiber-optic cable

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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