Recent

  • Show all results for ""

🎧 New: AI-Generated Podcasts Turn your study notes into engaging audio conversations. Learn more

Transport Layer Selective Repeat Protocol
24 Questions
0 Views

Transport Layer Selective Repeat Protocol

Created by
@LeanOak

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of the sender window in selective repeat protocol?

  • To store received packets out of order
  • To regulate the transmission rate
  • To detect packet errors
  • To buffer packets before transmission (correct)

    • What happens when the receiver's window size is equal to 3 in selective repeat protocol?

  • The receiver can accept packets with sequence numbers 0, 1, and 2 (correct)
  • The receiver can accept packets with errors
  • The receiver can accept packets out of order
  • The receiver can accept only three packets at a time

    • What is the consequence of a packet loss in selective repeat protocol?

  • The sender will retransmit the lost packet (correct)
  • The receiver will request retransmission of the lost packet
  • The connection will be terminated
  • The packet will be discarded

    • What is the purpose of sequence numbers in selective repeat protocol?

    <p>To ensure packet ordering</p> Signup and view all the answers

    What is the primary function of the sender window in selective repeat protocol?

    <p>To buffer out-of-order packets</p> Signup and view all the answers

    What is the consequence of a timeout in selective repeat protocol?

    <p>The sender will retransmit the packet</p> Signup and view all the answers

    What is the primary advantage of selective repeat protocol over other protocols?

    <p>Out-of-order packet delivery</p> Signup and view all the answers

    What is the base counting system used for sequencing packets in the example?

    <p>Base 4</p> Signup and view all the answers

    What is the role of the receiver window in selective repeat protocol?

    <p>To store received packets in order</p> Signup and view all the answers

    Why does the receiver window play a crucial role in selective repeat protocol?

    <p>To reassemble packets in the correct order</p> Signup and view all the answers

    What is the implication of the receiver's behavior in both cases?

    <p>The receiver's behavior is identical in both cases</p> Signup and view all the answers

    What is the purpose of base 4 counting in selective repeat protocol?

    <p>To sequence packets</p> Signup and view all the answers

    What is the purpose of sequence numbers in packet transmission?

    <p>To ensure packets are received in the correct order</p> Signup and view all the answers

    What is the relationship needed between the sender and receiver windows?

    <p>The sender and receiver windows must be identical</p> Signup and view all the answers

    What happens when a TCP receiver gets an in-order segment with a sequence number that is expected?

    <p>It sends a single cumulative ACK.</p> Signup and view all the answers

    What is the purpose of a duplicate ACK in TCP?

    <p>To indicate a gap in the sequence of received segments.</p> Signup and view all the answers

    What triggers a TCP fast retransmit?

    <p>Receipt of three duplicate ACKs.</p> Signup and view all the answers

    What is the purpose of the SendBase in TCP?

    <p>To keep track of the sequence number of the next expected byte.</p> Signup and view all the answers

    What happens when a TCP receiver gets an out-of-order segment with a higher sequence number?

    <p>It immediately sends a duplicate ACK.</p> Signup and view all the answers

    What is the purpose of a cumulative ACK in TCP?

    <p>To acknowledge the receipt of multiple segments.</p> Signup and view all the answers

    What happens when a TCP sender receives three duplicate ACKs?

    <p>It retransmits the unACKed segment with the smallest sequence number.</p> Signup and view all the answers

    What is the purpose of the sequence number in TCP?

    <p>To keep track of the order of received packets.</p> Signup and view all the answers

    What happens when a TCP receiver gets a segment that partially or completely fills a gap?

    <p>It immediately sends a single cumulative ACK.</p> Signup and view all the answers

    What is the purpose of the ACK in TCP?

    <p>To acknowledge the receipt of a segment.</p> Signup and view all the answers

    Study Notes

    Selective Repeat

    • Selective repeat has a sender window and receiver window
    • Sequence numbers (seq #s) are used, with base 4 counting (0, 1, 2, 3)
    • Window size determines how many packets can be sent before waiting for acknowledgement

    Dilemma Example

    • If packet 0 is lost, the receiver will accept packet 0 with sequence number 0
    • If packet 0 is retransmitted, the receiver will also accept it with sequence number 0
    • The receiver's behavior is identical in both cases, leading to a dilemma

    Receiver Behavior

    • If a packet with an expected sequence number arrives, the receiver sends an ACK
    • If a packet with a higher-than-expected sequence number arrives, the receiver sends a duplicate ACK
    • If a packet fills a gap, the receiver sends an ACK
    • If no packet arrives within a certain time (e.g. 500ms), the receiver sends an ACK for the next expected segment

    TCP Retransmission Scenarios

    • If a segment is lost, the sender retransmits the segment after a timeout
    • If an ACK is lost, the sender retransmits the segment after a timeout
    • A cumulative ACK can be sent to cover earlier lost ACKs

    TCP Fast Retransmit

    • If the sender receives three duplicate ACKs for the same data, it resends the unACKed segment with the smallest sequence number
    • This is likely due to the unACKed segment being lost, so the sender doesn't wait for a timeout

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz is about the Selective Repeat protocol in the Transport Layer of computer networks, focusing on sender and receiver windows.

    More Quizzes Like This

    Transport Layer in Computer Networks and Security Quiz
    10 questions

    Transport Layer Quiz: Computer Networks and Security Test

    CatchyRuby avatar
    CatchyRuby
    Transport Layer Quiz
    5 questions

    9.8.4 Transport Layer Quiz: Test Your Knowledge

    GenuineTropicalRainforest avatar
    GenuineTropicalRainforest
    Pores dans la couche lipidique et protéines de transport membranaire
    10 questions

    Pores dans la couche lipidique et protéines de transport membranaire

    UnlimitedPrairie avatar
    UnlimitedPrairie
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser