Principles of Reliable Data Transfer in Computer Networks
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Questions and Answers

What is the primary goal of reliable data transfer?

  • Ensuring no data loss and no errors in the transmitted bits (correct)
  • Optimizing data transfer speed
  • Minimizing the data transfer latency
  • Reducing the network congestion

    • What function is assumed for achieving reliable data transfer in the lecture?

  • Data loss prevention (dlp)
  • Fast data transfer (fdt)
  • Reliable data transfer (rdt) (correct)
  • Error-prone data transfer (edt)

    • How are the sender and receiver sides of the reliable data transfer protocol developed?

  • Sequentially
  • Simultaneously
  • Randomly
  • Incrementally (correct)

    • What is used to specify the sender and receiver event causing state transition in reliable data transfer protocol?

    <p>Finite state machines (FSM)</p> Signup and view all the answers

    What is the main characteristic of the 'state' in reliable data transfer protocol?

    <p>Next state is uniquely determined by next event</p> Signup and view all the answers

    In the context of rdt2.0, what is the purpose of using acknowledgements (ACKs)?

    <p>To explicitly tell the sender that the packet was received without errors</p> Signup and view all the answers

    What action does the sender take upon receiving a negative acknowledgement (NAK) in rdt2.0?

    <p>It retransmits the packet that was received with errors</p> Signup and view all the answers

    Why is it necessary for the sender to add a sequence number to each packet in rdt2.0?

    <p>To ensure correct delivery order at the receiver's end</p> Signup and view all the answers

    What happens if an ACK/NAK is not received by the sender in rdt2.0?

    <p>The sender doesn't know what happened at the receiver and can't just retransmit</p> Signup and view all the answers

    What is the purpose of using checksum in rdt2.0?

    <p>To detect bit errors in the packet during transmission</p> Signup and view all the answers

    Study Notes

    Reliable Data Transfer

    • The primary goal of reliable data transfer is to ensure that data is delivered correctly and in the correct order.

    Achieving Reliable Data Transfer

    • The function of achieving reliable data transfer is assumed by the transport layer in the lecture.

    Development of Reliable Data Transfer Protocol

    • The sender and receiver sides of the reliable data transfer protocol are developed independently.

    Specifying Sender and Receiver Event

    • Finite state machines are used to specify the sender and receiver event causing state transition in reliable data transfer protocol.

    Characteristics of 'State' in Reliable Data Transfer Protocol

    • The main characteristic of the 'state' in reliable data transfer protocol is that it is finite, meaning it has a limited number of possible states.

    RDT 2.0 Protocol

    Purpose of Acknowledgements (ACKs)

    • The purpose of using acknowledgements (ACKs) in RDT 2.0 is to confirm receipt of packets.

    Action upon Receiving Negative Acknowledgement (NAK)

    • Upon receiving a negative acknowledgement (NAK) in RDT 2.0, the sender takes the action of retransmitting the packet.

    Importance of Sequence Number

    • It is necessary for the sender to add a sequence number to each packet in RDT 2.0 to ensure that packets are delivered in the correct order.

    Handling Missing ACK/NAK

    • If an ACK/NAK is not received by the sender in RDT 2.0, the sender takes the action of retransmitting the packet.

    Purpose of Checksum

    • The purpose of using checksum in RDT 2.0 is to detect errors in the received packet and ensure data integrity.

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    Description

    This quiz covers the principles of reliable data transfer in computer networks, including topics such as flow control, congestion control, and the concept of no data loss and no bit errors. It is based on Lecture 8 by Dr. Dina Fawzy.

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