Computer Networking
After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?

None of these
Facsimile
Word processor
Telex
Electronic mail

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Computer Networking
X.21 is

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

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