NPTEL Advanced Computer Networks Week 4 Assignment Answers 2024

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NPTEL Advanced Computer Networks Week 4 Assignment Answers 2024

1. Assume that we have a token bucket algorithm to regulate traffic. If the tokens are arriving at a rate of 200 tokens per second and each token has a size of 50 bytes. How many packets can be transmitted per second if the packets have a fixed size of 2000 bytes?

  • 5
  • 10
  • 20
  • 50
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2. Which range of classes is known as the Assured Forwarding (AF) service levels?

  • Class 1 to 4
  • Class 2 to 3
  • Class 3 to 5
  • Class 4 to 5
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3. Which of the following conditions is/are valid for the max-min fair share algorithm resource allocation process?

  • No source gets a resource share larger than its demand
  • No source gets a resource share smaller than its demand
  • Max-min fairness allocates resources in order of increasing demand
  • Max-min fairness allocates resources their fair share to sources with unsatisfied demands
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4. Consider a network that employs a leaky bucket algorithm for traffic shaping. A system S injects 60 Megabytes of data into the network. The data is generated and transferred in bursts of 15 Mbps. What is the minimum buffer size required to prevent data loss if the minimum sustainable transmission rate across network routers is 7 Mbps?

  • 120 Megabytes
  • 256 Megabytes
  • 32 Megabytes
  • 60 Megabytes
Answer :- 

5. Which of the following per-hop behavior (PHB) is associated with the DSCP value ‘101110’?

  • Best Effort
  • Default Forwarding
  • Assured Forwarding
  • Expedited Forwarding
Answer :- 

6. In the Differentiated Services (DS) field of Differentiated Services Code Point (DSCP), what do the first three bits and the next three bits indicate?

  • Fragmentation Offset and Class Selector
  • Class Selector and Drop Precedence
  • Reserved Bits and Traffic Class
  • Drop Precedence and Explicit Congestion Notification
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7. What are the main types of services provided by Integrated services?

  • Expedited forwarding and Assured forwarding
  • Guaranteed service and Expedited forwarding
  • Controlled-load service and Guaranteed service
  • Guaranteed service and Assured forwarding
Answer :- 

8. What is the correct statement among the following related to integrated service and differentiated service?

  • Integrated services involve prior reservation of resources for the required quality of service, while differentiated services mark the packets with priority and send it to the network without prior reservation.
  • Integrated service marks packets with priority and send them to the network without prior reservation, while differentiated service involves reserving resources before starting the communication.
  • Integrated service uses a model based on service classes and per-hop behaviours associated with each class, while differentiated service provide services on a per-flow basis.
  • Integrated service offers more scalability and flexibility than differentiated service.
Answer :- 

9. Which of the following statements is/are incorrect about circuit-switched and packet-switched networks?

  • Circuit-switched networks use a dedicated path for communication, whereas packet-switched networks utilize a shared path for communication.
  • In circuit-switched networks, resources are not reserved, whereas in packet-switched networks, resources are reserved for the entire communication session.
  • Circuit-switched networks employ a variable transmission rate for communication, while packet-switched networks maintain a constant transmission rate.
  • Circuit-switched networks do not need to establish dedicated channels for communication and can use any available path, whereas packet-switched networks require dedicated channels for communication.
Answer :- 

10. Consider the ten users, U1, U2, U3, U4, U5, U6, U7, U8, U9, and U10, having bandwidth demands of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 Mbps, respectively. The router to which these users connect has a total bandwidth of 40 Mbps to another downstream router. What proportion of bandwidth in Mbps is allocated to user U9 when the router uses the Max-Min fair scheduling algorithm to allocate the bandwidth?

  • 2
  • 3
  • 5
  • 9
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