Computer Networking
Messages from one computer terminal can be sent to another by using data networks. The message to be sent is converted to an electronic digital signal, transmitted via a cable, telephone or satellite and then converted back again at the receiving end. What is this system of sending messages called?

Electronic newspaper
Global network
Electronic mail
Paperless office
None of these

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Computer Networking
HDLC (High-level Data Link Control) is

a very common bit-oriented data link protocol issued by ISO.
None of these
a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media

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