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?

Paperless office
Global network
Electronic newspaper
None of these
Electronic mail

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

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

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Computer Networking
Which of the following summation operations is performed on the bits to check an error-detecting code?

Attenuation
Coder-decoder
Checksum
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions
Codec

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