Networking – Section 9

11. Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?

A. 1 slots
B. 5 slots
C. 10 slots
D. 14 slots

Correct Answer: B. 5 slots

12. When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?

A. 80
B. 100
C. 30
D. 150
E. None of the above

Correct Answer: C. 30

13. Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as

A. Amplitude-shift keying
B. Amplitude
C. Amplitude modulation
D. Aloha
E. None of the above

Correct Answer: A. Amplitude-shift keying

14. You have been contracted to install a windows NT network in an office that is located in a strip mall. The office is located next to the power plant of the building, so a UPS (uninterruptible power supply) has already been installed. What type of cable should you use for the network cabling? Choose the best answer.

A. TI
B. UTP
C. Fiber-optic
D. PSTN
E. STP

Correct Answer: E. STP

15. Communication circuits that transmit data in both directions but not at the same time are operating in

A. a simplex mode
B. a half-duplex mode
C. a full-duplex mode
D. an asynchronous mode
E. None of the above

Correct Answer: B. a half-duplex mode

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