3.1-transport-udp rdt
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Questions and Answers

Which protocol uses a 'window' of up to N consecutive transmitted but unACKed packets?

  • Go-Back-N (correct)
  • Receiver view
  • Selective repeat
  • Transport Layer

    • What does the sender do when it receives an ACK(n) in the Go-Back-N protocol?

  • Buffer out-of-order packets
  • Send ACK for correctly-received packet so far
  • Resend packet n and all higher seq # packets in window
  • Move window forward to begin at n+1 (correct)

    • What does the receiver do when it receives an out-of-order packet in the Go-Back-N protocol?

  • Send ACK for the packet
  • Resend the packet
  • Discard the packet
  • Buffer the packet (correct)

    • What does the receiver do when it receives a correctly-ordered packet in the Go-Back-N protocol?

    <p>Send ACK for the packet</p> Signup and view all the answers

    What does the sender do when it receives a duplicate ACK in the Go-Back-N protocol?

    <p>Ignore the ACK</p> Signup and view all the answers

    What does the sender do when it times out in the Selective repeat protocol?

    <p>Resend all unACKed packets</p> Signup and view all the answers

    What is the purpose of the sender window in the Selective repeat protocol?

    <p>Limits seq #s of sent, unACKed packets</p> Signup and view all the answers

    What is the purpose of the receiver window in the Selective repeat protocol?

    <p>Buffers packets for in-order delivery</p> Signup and view all the answers

    What does the receiver do when it receives an out-of-order packet in the Selective repeat protocol?

    <p>Buffer the packet</p> Signup and view all the answers

    What does the receiver do when it receives a correctly-ordered packet in the Selective repeat protocol?

    <p>Send ACK for the packet</p> Signup and view all the answers

    What is the purpose of the sender window in the Go-Back-N protocol?

    <p>The sender window in the Go-Back-N protocol limits the sequence numbers of sent, unACKed packets.</p> Signup and view all the answers

    What is the purpose of the receiver window in the Go-Back-N protocol?

    <p>The receiver window in the Go-Back-N protocol helps the receiver keep track of the sequence numbers of received and ACKed packets.</p> Signup and view all the answers

    What does the sender do when it times out in the Go-Back-N protocol?

    <p>When the sender times out in the Go-Back-N protocol, it retransmits the oldest in-flight packet and all higher sequence number packets in the window.</p> Signup and view all the answers

    What does the receiver do when it receives an out-of-order packet in the Selective repeat protocol?

    <p>When the receiver receives an out-of-order packet in the Selective repeat protocol, it can choose to either discard the packet or buffer it, depending on the implementation.</p> Signup and view all the answers

    What relationship is needed between sequence number size and window size to avoid a dilemma in the Selective repeat protocol?

    <p>To avoid a dilemma in the Selective repeat protocol, the sequence number size should be greater than or equal to the window size.</p> Signup and view all the answers

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