Basic Computer Networks Questions and Answers

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Q191
In the carrier sense network if the prevailing condition is a 'channel busy', then which of the following are correct ?
  • A If the technique used is non-persistent then it results in randomised wait and sense
  • B If the technique used is 1-persistent then the channel is continually sensed.
  • C If the technique used is p-persistent then randomised retransmissionis done.
  • D If the method used is non-persistent then continuous sensing results.
Answer: Option
Q192
Which of the following are non-polling systems ?
  • A TDMA
  • B Stop and Wait
  • C Xon/Xoff
  • D Token passing
Answer: Option
Q193
Pick the systems that can be used in both priority and non-priority modes.
  • A TDM
  • B Register insertion
  • C Carrier sense systems
  • D Token passing
Answer: Option
Q194
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)?
  • A 300
  • B 240
  • C 250
  • D 275
Answer: Option A
Q195
Which one the following network uses dynamic or adaptive routing ?
  • A TYMNET
  • B ARPANET
  • C SNA (IBM's System Network Architecture)
  • D None of the above
Answer: Option B
Q196
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
  • A 100
  • B 45
  • C 50
  • D 90
Answer: Option B
Q197
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 ?
  • A 4
  • B 16
  • C 8
  • D 28
Answer: Option C
Q198
The difference between a multiplexer and a statistical multiplexer is:
  • A Multiplexers use TDM (time dividion multiplexing), while statistical multiplexer uses FDM (frequency division multiplexing).
  • B Multiplexers often waste the output link capacity. while statistical multiplexers optimize its use.
  • C Statistical multiplexers need buffers while multiplexers do not need buffers.
  • D Multiplexers use the D.25 protocol, while statistical multiplexers use the ALOHA protocol.
Answer: Option C
Q199
A moern constellation diagram has data points at (0,1) and (0,2). What type of modulation does the modern use ?
  • A Phase modulation
  • B Amplitude modulation
  • C Both (a) and (b)
  • D None of the above
Answer: Option B
Q200
Maximum data rate of a channel for a noiseless 3-kHz binary channel is
  • A 300 bps
  • B 6000 bps
  • C 1500 bps
  • D none of the above
Answer: Option B

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