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I’m trying to learn for my Computer Science class and I’m stuck. Can you help?
1. How many digits of the DNIC (Data Network Identification Code) identify the country?
A. first three
B. first four
C. first five
D. first six
E. None of the above
2.
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
A. 0.003
B. 0.009
C. 0.991
D. 0.999
E. None of the above
3.
Which of the following condition is used to transmit two packets over a medium at the same time?
A. Contention
B. Collision
C. Synchronous
D. Asynchronous
E. None of the above
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