Computer Networking
A network that requires human intervention of route signals is called a

None of these
star network
T-switched network
bus network
ring network

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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 method access control technique for multiple-access transmission media
None of these
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO

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