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Test

Exam 1

Thomas Mayfield 25 preguntas

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Preguntas del test (25)

  1. 1Which of the following is not one of the guidelines of a physical layer
    standard?
    1. AWhat kind of cable to use.
    2. BWhat connectors to use
    3. CHow the messages will be formatted.
    4. DHow the cables and devices should be arranged.
  2. 2In class, I explained the physical layer as being the truck, and that only a
    truck can deliver messages. Which one of the following truck metaphors
    are not true to how the physical layer works?
    1. APhysical links are needed between all devices on a network, just like you
      need a truck to deliver messages
    2. BA new physical link will be followed after a frame hits a switch, just like
      your message will be loaded into a new truck at the post office.
    3. CA message arrives at a device all at once, just like a truck pulls up to a
      loading dock and unloads packages.
    4. DAll of the above are true about how the physical layer works.
  3. 3Which of the following correctly describes the propagation effect?
    1. AAttenuation: a light beam becomes dimmer the further away it is from the
      sender.
    2. BDistortion: other signals get mixed in with the sender's signal.
    3. CAttenuation: the part of the signal that follows a direct path reaches the
      receiver first.
    4. DInterference: for media with low attenuation, interference limits link length.
  4. 4Which of the following correctly describes why there is a length limit for
    wireless links?
    1. ADistortion of the radio waves caused by multipath interference makes it so
      it is hard to tell a one from a zero.
    2. BInterference from intermittent noise sources like lightning strikes means
      that the sender must be very close to the receiver.
    3. CAs a signal propagates, it becomes entangled with more than 16 photons
      and the receiver can only untangle an octet.
    4. DWhen you reach the point where the signal has attenuated so much that
      you can no longer read it over background noise, you are too far away.
  5. 5An IP address typically uses 8 bits to identify each host, meaning that
    each host on a subnet must have a different combination of these bits in
    that part of their address. How many different values can be represented
    using 8 bits?
    1. A64
    2. B16
    3. C256
    4. D65,536
  6. 6In typical signaling over copper cable, a certain type of voltage is used to
    represent 1s, while another represents 0s. This makes it easy to tell the
    difference between a 1 and a 0. Which of the following is true?
    1. AA negative voltage is used for 1s while a positive voltage is used for 0s.
    2. BA high voltage is used to represent 1s while no voltage represents 0s.
    3. CThe voltage used for 1s is twice as high as the one used for 0s
    4. DA high voltage is used to represent 0s while no voltage represents 1s.
  7. 7What is the difference between binary and digital signals?
    1. ABinary signals send multiple bits per clock cycle
    2. BDigital signals are clearer than binary signals.
    3. CDigital signals have more resistance to propagation errors
    4. DBinary signals have two states
  8. 8On a wire that can only support 100K cycles per second, how can you
    send 400Kbps?
    1. AIf there are three states
    2. BIf there are eight states.
    3. CIf there are 16 states.
    4. DIf there are four states
  9. 9Using 100Base-TX, how do you get full-duplex transmission?
    1. ATwo connections involving four devices can be made over the same cable.
    2. BOne wire pair is used for sending signals, while another wire pair is used to
      receive
    3. CAll eight wires are twisted together.
    4. DFour wire pairs x two wires per pair = full duplex.
  10. 10DSL uses the same unshielded twisted pair cabling that phone companies
    installed for telephone service, while cable modem service uses the
    shielded coaxial cabling that cable companies installed for television
    service. Which of the following correctly describes the difference between
    DSL and cable Internet service?
    1. APhone wires from everyone's house in a neighborhood get grouped
      together in trunk lines, so each house has even higher capacity
    2. BThe phone company's cables are immune from crosstalk interference.
    3. CThe cable company ran separate cables to each person's house, so cable
      customers have QoS guarantees.
    4. DCoaxial cabling is resistant to interference, so higher bit rates are possible
      over a wide bandwidth.

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Test sobre Exam 1, creado por Thomas Mayfield el 03/10/2022.
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