Basic Computer Networks Questions and Answers

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Q111
Which of the following access control methods is probabilstic ?
  • A polling
  • B contention
  • C token passing
  • D sliding window
Answer: Option D
Q112
In session layer, during data transfer, the data stream responsible for the control purpose (i.e. control of the session layer itself) is
  • A regular data
  • B typed data
  • C capability data
  • D extended data
Answer: Option C
Q113
In context of OSI or TCP/IP computer network models, which one of the following is FALSE ?
  • A besides the apan of geographical area, the other major difference between LAN and WAN is that the later uses switching element
  • B a repeater is used just to another one
  • C IP layer is connected oriented layer in TCP/IP
  • D a gateway is used to connect incompatible networks
Answer: Option C
Q114
The physical layer in reference to the OSI model defines
  • A data link procedures that provide for the exchange of data via frames that can be sent and received
  • B the interface between X.25 network and packet mode device
  • C the virtual circuit interface to packet-switched service
  • D all of the above
Answer: Option D
Q115
In stop-and-wait ARQ, if data 1 has an error, the receiver sends which frame ?
  • A NAK 0
  • B NAK 1
  • C NAK 2
  • D NAK
Answer: Option D
Q116
In which ARQ, when a NAK is received, all frames sent since the last frame acknowledged are retransmitted
  • A stop-and-wait
  • B go-back-n
  • C selective-reject
  • D (a) and (b)
Answer: Option B
Q117
In which communication, the poll/select method is used to determine control of the line?
  • A peer-to peer
  • B peer-to-primary
  • C primary-to-peer
  • D primary-to-secondary
Answer: Option D
Q118
Poll/select line discipline requires what to identify the packet recipient ?
  • A a timer
  • B a buffer
  • C an address
  • D a dedicated line
Answer: Option C
Q119
Which of the following are non-polling system ?
  • A TDMA
  • B stop and wait
  • C Xon/Xoff
  • D continuous ARQ
Answer: Option
Q120
The secondary device in a multipoint configuration sends data in response to which of the following event ?
  • A an ACK
  • B an ENQ
  • C a poll
  • D a sel
Answer: Option C

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