Basic Computer Networks Questions and Answers

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Q181
Error detection at the data link level is achieved by
  • A bit stuffing
  • B cyclic redundancy codes
  • C Hamming codes
  • D equalization
Answer: Option B
Q182
Which of the following is a wrong example of a network layer ?
  • A Internet Protocol (IP)-ARPANET
  • B X.25 Packet Level Protocol (PLP)-ISO
  • C Source routing and domain naming-USENET
  • D X.25 Level 2-ISO
Answer: Option D
Q183
The topology with highest reliability is
  • A bus topology
  • B star topology
  • C ring topology
  • D mesh topology
Answer: Option D
Q184
baud means
  • A the number of bits transmitted per unit time
  • B the number of bytes transmitted per unit time
  • C the rate at which the signal changes
  • D none of the above
Answer: Option C
Q185
Start and stop bits are used in serial communication for
  • A error detection
  • B error correction
  • C synchronization
  • D slowing down the communication
Answer: Option C
Q186
Unmodulated signal coming from a transmitter is known as
  • A carrier signal
  • B baseband signal
  • C primary signal
  • D none of the above
Answer: Option B
Q187
Manchester code is a
  • A Bi-polar code
  • B non return to zero code
  • C polar code
  • D none of the above
Answer: Option
Q188
Pick the incorrect statements.
  • A Another name for primary/secondary protocol is master/slave
  • B Peer to peer protocol provides equal status to all sites on the channel.
  • C Priority, non-priority types come under master/slave protocol
  • D TDM is a primary/secondary non-priority system.
Answer: Option
Q189
Pick the correct statements.
  • A A switched circuit is a dial-up circuit that may encounter blockage (busy signal).
  • B Non switched leased line supports higher data volume and quality than switched lines.
  • C Non switched lines are expensive for high volume data
  • D Switched circuit provides faster response time.
Answer: Option
Q190
Pick the incorrect statements that pertain to error retransmission used in continuous ARQ method.
  • A Go-back-N method required more storage at the receiving site
  • B Selective Repeat involves complex login than Go-bak-N.
  • C Go-back-N has better line utilisation
  • D Selective Repeat has better line utilisation
Answer: Option

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