Basic Computer Networks MCQ Question and Answer
Basic Computer Networks MCQ Question and Answer
191. In the carrier sense network if the prevailing condition is a 'channel busy', then which of the following are correct ?
- If the technique used is non-persistent then it results in randomised wait and sense
- If the technique used is 1-persistent then the channel is continually sensed.
- If the technique used is p-persistent then randomised retransmissionis done.
- If the method used is non-persistent then continuous sensing results.
192. Which of the following are non-polling systems ?
- TDMA
- Stop and Wait
- Xon/Xoff
- Token passing
193. Pick the systems that can be used in both priority and non-priority modes.
- TDM
- Register insertion
- Carrier sense systems
- Token passing
194. How many character per sec (7bits + 1 parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 start and 1 stop bit)?
- 300
- 240
- 250
- 275
195. Which one the following network uses dynamic or adaptive routing ?
- TYMNET
- ARPANET
- SNA (IBM's System Network Architecture)
- None of the above
196. The number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self connection is
- 100
- 45
- 50
- 90
197. A terminal multiplexer has six 1200 bps terminals and 'n' 300 bps terminals connected to it. The outgoing line is 9600 bps. What is the maximum value of n ?
- 4
- 16
- 8
- 28
198. The difference between a multiplexer and a statistical multiplexer is:
- Multiplexers use TDM (time dividion multiplexing), while statistical multiplexer uses FDM (frequency division multiplexing).
- Multiplexers often waste the output link capacity. while statistical multiplexers optimize its use.
- Statistical multiplexers need buffers while multiplexers do not need buffers.
- Multiplexers use the D.25 protocol, while statistical multiplexers use the ALOHA protocol.
199. A moern constellation diagram has data points at (0,1) and (0,2). What type of modulation does the modern use ?
- Phase modulation
- Amplitude modulation
- Both (a) and (b)
- None of the above
200. Maximum data rate of a channel for a noiseless 3-kHz binary channel is
- 300 bps
- 6000 bps
- 1500 bps
- none of the above