Computer Networking
A distributed network configuration in which all data/information pass through a central computer is

bus network
star network
Point-to-point network
None of these
ring network

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Computer Networking
X.21 is

a method access control technique for multiple-access transmission media
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

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