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Where’s the receiving window of R after Frame 2 is received correctly? Did R then send ACK or NAK to S? Where’s the sending window of S after receiving the acknowledgement?

Where’s the receiving window of R after Frame 2 is received correctly? Did R then send ACK or NAK to S? Where’s the sending window of S after receiving the acknowledgement?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Based on the picture,

  • Where’s the receiving window of R after Frame 2 is received correctly?
  • Did R then send ACK or NAK to S?
  • Where’s the sending window of S after receiving the acknowledgement?
**Selective Repeat with NAK** In this diagram, the process of the Selective Repeat Automatic Repeat reQuest (ARQ) protocol is depicted, highlighting the interaction between the sender (S) and receiver (R) with the use of Acknowledgments (ACKs) and Negative Acknowledgments (NAKs). **Components of the Diagram:** - **Time:** The vertical axis shows the progression of events over time. - **Sending Window:** Initially, the sender's window contains frames 0 and 1, indicating the frames ready to be sent. - **Frame Transmission:** - Frame 0 is sent from the sender (S) to the receiver (R). - Frame 1 is sent and acknowledged (ACK 1) by the receiver. - **Frame 2 Transmission:** - Frame 2 is attempted but marked with an 'X' indicating an error in transmission. - As a result, Frame 3 is sent, but a NAK 2 is received, requesting the retransmission of Frame 2. - **Retransmissions:** - Frame 2 is sent again and is acknowledged. - **Current Window State:** - The sender's window adjusts according to the acknowledgments, allowing new frames to enter the window for transmission. - The receiver's window moves forward as frames are correctly received and acknowledged. **Question:** - A red line at the bottom raises a question for learners: "ACK or NAK?", inviting them to consider the state of the network protocol and the status of the window management. The diagram provides a visual illustration of how the Selective Repeat ARQ protocol operates, allowing only erroneous frames to be retransmitted, thereby increasing efficiency compared to other protocols such as Go-Back-N.
Transcribed Image Text:**Selective Repeat with NAK** In this diagram, the process of the Selective Repeat Automatic Repeat reQuest (ARQ) protocol is depicted, highlighting the interaction between the sender (S) and receiver (R) with the use of Acknowledgments (ACKs) and Negative Acknowledgments (NAKs). **Components of the Diagram:** - **Time:** The vertical axis shows the progression of events over time. - **Sending Window:** Initially, the sender's window contains frames 0 and 1, indicating the frames ready to be sent. - **Frame Transmission:** - Frame 0 is sent from the sender (S) to the receiver (R). - Frame 1 is sent and acknowledged (ACK 1) by the receiver. - **Frame 2 Transmission:** - Frame 2 is attempted but marked with an 'X' indicating an error in transmission. - As a result, Frame 3 is sent, but a NAK 2 is received, requesting the retransmission of Frame 2. - **Retransmissions:** - Frame 2 is sent again and is acknowledged. - **Current Window State:** - The sender's window adjusts according to the acknowledgments, allowing new frames to enter the window for transmission. - The receiver's window moves forward as frames are correctly received and acknowledged. **Question:** - A red line at the bottom raises a question for learners: "ACK or NAK?", inviting them to consider the state of the network protocol and the status of the window management. The diagram provides a visual illustration of how the Selective Repeat ARQ protocol operates, allowing only erroneous frames to be retransmitted, thereby increasing efficiency compared to other protocols such as Go-Back-N.
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