Basic Computer Networks MCQ Question and Answer

Basic Computer Networks MCQ Question and Answer
61. Manchester code is a
  • non-return to zero code
  • polar code
  • both (a) and (b) above
  • none of these
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62. In the carrier sense network if the prevailing condition is a 'channel busy' then if the technique used is
  • non-presistent then it results in randomised wait and sense
  • 1-persistent then the channel is continually sensed
  • p-persistent then randomised retransmission is done
  • both (a) (b) above
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63. Non-polling system is
  • TDMA
  • stop and wait
  • continuous ARQ
  • none of these
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64. The system that can be used in both priority and non-priority modes is
  • TDM
  • Register-insertion
  • carrier sense systems
  • All of these
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65. How many characters per sec (7 bits + 1 parity) can be transmitted over a 2400 bps line if the transfer is asynchronous (1 start and 1 stop bit) ?
  • 300
  • 240
  • 250
  • 275
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66. How many characters per sec (7 bits + 1 parity) can be transmitted over a 2400 bps line if the transfer is asynchronous (1 start and 1 stop bit) ?
  • 300
  • 240
  • 250
  • 275
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67. Hamming distance between 001111 and 010011 is
  • 1
  • 2
  • 3
  • 4
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68. BSC is a
  • character-oriented protocol
  • bit-oriented protocol
  • full-duplex protocol
  • none of these
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69. HDLC is
  • bit-oriented
  • code dependent
  • both (a) and (b)
  • none of these
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70. Bit stuffing refers to
  • inserting a '0' in flag steam to avoid ambiguity it with a flag
  • inserting a '0' in flag stream to avoid ambiguity
  • appending a nibble to the flag sequence
  • appending a nibble to the use data stream
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