Computer Networks Lecture 3: Network Performance and Security
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Questions and Answers

What are the parameters used to measure network performance?

  • Loss, Queue length, Network security
  • Loss, Delay, Throughput (correct)
  • Delay, Throughput, Network congestion
  • Queue length, Network congestion, Network delay

    • In computer networks, what is a queue?

  • A type of network protocol
  • A parameter used to measure network performance
  • A collection of data packets waiting to be transmitted (correct)
  • A method of securing the network

    • What does network congestion lead to?

  • Security breach
  • Network scalability
  • Throughput and queue length
  • Loss and delay (correct)

    • What causes network delay in the presence of excessive network traffic?

    <p>Large queue size</p> Signup and view all the answers

    Which of the following is NOT a parameter used to measure network performance?

    <p>Network security</p> Signup and view all the answers

    What is a collection of data packets collectively waiting to be transmitted by a network device known as?

    <p>Queue</p> Signup and view all the answers

    What is packet loss?

    <p>Packets that are discarded due to reaching the maximum queue capacity</p> Signup and view all the answers

    Which time delay is dependent on the packet length and transmission rate?

    <p>Transmission time</p> Signup and view all the answers

    What is the most dominant time delay in network performance?

    <p>Queueing time</p> Signup and view all the answers

    Which factor determines whether the queuing time will be small or large?

    <p>Transmission rate (L/R)</p> Signup and view all the answers

    What does propagation delay depend on?

    <p>Wire length</p> Signup and view all the answers

    In the Caravan Scenario, what does the transmission time depend on?

    <p>Packet length (bits)</p> Signup and view all the answers

    What is the propagation delay in the Caravan Scenario with a 1000 km direct link and propagation speed of 2.5 x 10^8 meters/sec?

    <p>$0.005$ seconds</p> Signup and view all the answers

    What is the transmission delay for sending a file of 2000 bytes from A to B over a direct link of R = 2 Mbps?

    <p>$0.08$ seconds</p> Signup and view all the answers

    What is not a dominant time delay in network performance?

    <p><strong>Propagation</strong> time</p> Signup and view all the answers

    Which factor determines the queuing time in a network?

    <p>$a$: average packet arrival rate</p> Signup and view all the answers

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