Computer Networking
The basic Ethernet design does not provide

automatic retransmission of a message
None of these
access control
addressing
multiple virtual networks

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Computer Networking
X.21 is

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

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