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Tuesday, January 29, 2013

Switching - MCQs

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Multiple choice questions for Switching in Datacom
In this particular topic you have learned the three fundamental switching methods: circuit switching, packet switching, and message switching. If you skip the summary visit Switching which is a method in which communication devices are connected to one another efficiently.

Begin and Good luck!
  1. Packet-switched networks can also be divided into ______subcategories: virtual-circuit networks and datagram networks.
    • A)   five
    • B)   three
    • C)   two
    • D)   four
  2. In __________, each packet is treated independently of all others.
    • A)   circuit switching
    • B)   datagram switching
    • C)   frame switching
    • D)   none of the above
  3. Based on the Clos criteria, if N = 200, then k must be equal to or greater than ______.
    • A)   19
    • B)   21
    • C)   31
    • D)   41
  4. In _________, resources are allocated on demand.
    • A)   circuit switching
    • B)   datagram switching
    • C)   frame switching
    • D)   none of the above
  5. In _______ switching, the paths in the circuit are separated from one another spatially.
    • A)   time-division
    • B)   two-dimensional
    • C)   space-division
    • D)   three-dimensional
  6. In a ________ network, two types of addressing are involved: global and local.
    • A)   datagram
    • B)   virtual-circuit
    • C)   circuit-switched
    • D)   none of the above
  7. In a three-stage space division switch, if N = 200, the number of crosspoints is ______.
    • A)   40,000
    • B)   less than 40,000
    • C)   greater than 40,000
    • D)   greater than 100,000
  8. A ________ network is made of a set of switches connected by physical links, in which each link is divided into n channels.
    • A)   circuit-switched
    • B)   line-switched
    • C)   frame-switched
    • D)   none of the above
  9. In a banyan switch, for 8 inputs and 8 outputs, we have _____ microswitches at each stage.
    • A)   2
    • B)   3
    • C)   4
    • D)   8
  10. In _________, there is no resource allocation for a packet.
    • A)   circuit switching
    • B)   datagram switching
    • C)   frame switching
    • D)   none of the above
  11. A _________ network is a cross between a circuit-switched network and a datagram network. It has some characteristics of both.
    • A)   packet-switched
    • B)   frame-switched
    • C)   virtual-circuit
    • D)   none of the above
  12. The most popular technology in time-division switching is called the _________.
    • A)   TSI
    • B)   STI
    • C)   ITS
    • D)   none of the above
  13. A switched WAN is normally implemented as a _______ network.
    • A)   virtual-circuit
    • B)   datagram
    • C)   circuit-switched
    • D)   none of the above
  14. We can say that a packet switch has _______ types of components.
    • A)   four
    • B)   three
    • C)   two
    • D)   none of the above
  15. In a one-stage space division switch, if N = 200, the number of crosspoints is ______.
    • A)   20,000
    • B)   40,000
    • C)   30,000
    • D)   10,000
  16. In a banyan switch, for 8 inputs and 8 outputs, we have _____ stages.
    • A)   2
    • B)   3
    • C)   4
    • D)   8
  17. A switch in a datagram network uses a routing table that is based on the ______ address.
    • A)   destination
    • B)   source
    • C)   local
    • D)   none of the above
  18. Traditionally, _____ methods of switching have been important.
    • A)   six
    • B)   five
    • C)   four
    • D)   three
  19. The network layer in the Internet is designed as a __________ network.
    • A)   circuit-switched
    • B)   datagram
    • C)   virtual-circuit
    • D)   none of the above
  20. A ________ switch combines space-division and time-division technologies to take advantage of the best of both.
    • A)   SSS
    • B)   TST
    • C)   TTT
    • D)   none of the above
  21. In _______, the resources need to be reserved during the setup phase; the resources remain dedicated for the entire duration of data transfer phase until the teardown phase.
    • A)   frame switching
    • B)   datagram switching
    • C)   circuit switching
    • D)   none of the above
  22. Based on the Clos criteria, if N = 200, then n must be equal to or greater than ____.
    • A)   40
    • B)   30
    • C)   20
    • D)   10
  23. Circuit switching takes place at the ________ layer.
    • A)   physical
    • B)   data line
    • C)   network
    • D)   transport
  24. A ________ switch combines crossbar switches in several (normally three) stages.
    • A)   multiple path
    • B)   multiple crossbar
    • C)   multistage
    • D)   none of the above
  25. In _______ there are no setup or teardown phases.
    • A)   circuit switching
    • B)   datagram switching
    • C)   frame switching
    • D)   none of the above
  26. We can divide today's networks into ____ broad categories.
    • A)   five
    • B)   four
    • C)   three
    • D)   two
  27. A ________ switch is a multistage switch with microswitches at each stage that route the packets based on the output port represented as a binary string.
    • A)   TSI
    • B)   banyan
    • C)   crossbar
    • D)   none of the above
  28. The _______ address in the header of a packet in a datagram network normally remains the same during the entire journey of the packet.
    • A)   destination
    • B)   source
    • C)   local
    • D)   none of the above
  29. Based on the Clos criteria, if N = 200, then the minimum number of crosspoints is greater than or equal to _______.
    • A)   42,000
    • B)   20,000
    • C)   18,000
    • D)   15,200
  30. The simplest type of switching fabric is the ______ switch.
    • A)   crossbar
    • B)   crosspoint
    • C)   TSI
    • D)   STS

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