Internet Structure and ISPs Quiz
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Questions and Answers

In Time Division Multiplexing (TDM), how is time divided?

  • Into slots (correct)
  • Into periodic slots
  • Into narrow frequency bands
  • Into wider frequency bands

    • In Frequency Division Multiplexing (FDM), how are optical and electromagnetic frequencies divided?

  • Into wider frequency bands
  • Into periodic slots
  • Into narrow frequency bands (correct)
  • Into slots

    • How many users can use a network under circuit-switching if each user is active 10% of the time on a 1 Gbps link?

  • 35 users
  • 4 users
  • 10 users (correct)
  • 50 users

    • What is the probability of having more than 10 users active at the same time in a network with 35 users?

    <p>&gt; 0.0004</p> Signup and view all the answers

    Is packet switching a 'slam dunk winner' over circuit switching according to the text?

    <p>It depends</p> Signup and view all the answers

    What are the dedicated resources in circuit-like performance segments used for if not used by a call?

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

    What term best describes the Internet structure according to the text?

    <p>Hierarchical network</p> Signup and view all the answers

    In the context of the text, what is an Internet Exchange Point (IXP) primarily used for?

    <p>Connecting ISPs and facilitating the exchange of traffic</p> Signup and view all the answers

    Which term refers to the entities that may emerge to compete with a global ISP in the internet industry?

    <p>Regional networks</p> Signup and view all the answers

    What are some of the key components of the 'Network Edge'?

    <p>Hosts, access network, physical media</p> Signup and view all the answers

    What aspect of internet performance is specifically mentioned in the text alongside loss and throughput?

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

    Which concept is discussed in Chapter 1 of the text alongside topics like 'What is the Internet?' and 'What is a protocol'?

    <p>'Network edge: hosts, access network, physical media'</p> Signup and view all the answers

    What is a major advantage of packet-switching networks mentioned in the text?

    <p>Lower latency compared to circuit-switching networks</p> Signup and view all the answers

    How does excessive congestion impact packet-switching networks?

    <p>Results in packet delay and loss</p> Signup and view all the answers

    What is the challenge in providing circuit-like behavior with packet-switching?

    <p>Replicating reserved resources of circuit switching</p> Signup and view all the answers

    In the context of Internet structure, what role do access ISPs play?

    <p>Ensuring connection between any two hosts on the Internet</p> Signup and view all the answers

    How is the Internet structure described in the text?

    <p>&quot;A network of networks&quot; with complex interconnections</p> Signup and view all the answers

    What is the driving force behind the evolution of the Internet structure as per the text?

    <p>Economics and national policies</p> Signup and view all the answers

    What happens when the arrival rate to a link temporarily exceeds the output link capacity?

    <p>Packets queue in router buffers</p> Signup and view all the answers

    Which of the following is true about the queueing delay in packet transmission?

    <p>It depends on the congestion level of the router</p> Signup and view all the answers

    What is the formula for transmission delay (dtrans) in packet delay calculations?

    <p>$L/R$</p> Signup and view all the answers

    What does the propagation delay (dprop) depend on in packet transmission?

    <p>Physical length of the link and propagation speed</p> Signup and view all the answers

    In the caravan analogy given, what does the toll booth represent?

    <p>Link in a data network</p> Signup and view all the answers

    What is meant by 'nodal processing' in packet delay calculations?

    <p>Checking bit errors and determining output link</p> Signup and view all the answers

    What is the time taken for the last car to propagate from the 1st to the 2nd toll booth in the caravan analogy?

    <p>1 hour</p> Signup and view all the answers

    Based on the information provided, what is the average queueing delay when La/R is close to 1?

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

    In the caravan analogy, what is the speed at which the cars propagate after 'suppose cars now “propagate” at 1000 km/hr'?

    <p>1000 km/hr</p> Signup and view all the answers

    What happens when La/R is greater than 1 in terms of packet queueing delay?

    <p>Average queueing delay increases</p> Signup and view all the answers

    What does the traceroute program provide in terms of Internet path measurement?

    <p>Delay measurement from source to destination</p> Signup and view all the answers

    After how many cars arrive at the second toll booth in the caravan analogy, there are still three cars at the first booth?

    <p>7 minutes</p> Signup and view all the answers

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