Computer Networking
What is the name given to the exchange of control signals which is necessary for establishing a connection between a modem and a computer at one end of a line and another modem and computer at the other end?

Modem options
None of these
Duplexing
Handshaking
Protocol

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Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO
None of these
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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