Computer Networking
How many digits of the DNIC (Data Network Identification Code) identify the country?

first three
first four
None of these
first five
first six

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

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 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.

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