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The segment sent at t=4 is lost, as is the ACK segment sent at t-7. t=1 t=2+ t=3 TCP sender t=47 t=5+ t=6+ 200 100 300 t=11 t=12 t=13 t=14 t=15 t=16 400 t=17 t=18 7 I I data segment data segment data segment data segment data segment data segment data segment data segment ACK ACK ACK ACK ACK 3.5-2d. TCP sequence and ACK numbers (d). Consider again the figure above where a TCP sender sends 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, 8 and the segment sent at t=4 is lost, as is the ACK segment sent at t=7. What is the ACK value carried in the receiver-to-sender ACK sent at t = 10? ACK TCP receiver O None of these other answers. t=6 t=7 t=8 t=9 t=10 t=11 t=12 t=13

The segment sent at t=4 is lost, as is the ACK segment sent at t-7. t=1 t=2+ t=3 TCP sender t=47 t=5+ t=6+ 200 100 300 t=11 t=12 t=13 t=14 t=15 t=16 400 t=17 t=18 7 I I data segment data segment data segment data segment data segment data segment data segment data segment ACK ACK ACK ACK ACK 3.5-2d. TCP sequence and ACK numbers (d). Consider again the figure above where a TCP sender sends 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, 8 and the segment sent at t=4 is lost, as is the ACK segment sent at t=7. What is the ACK value carried in the receiver-to-sender ACK sent at t = 10? ACK TCP receiver O None of these other answers. t=6 t=7 t=8 t=9 t=10 t=11 t=12 t=13

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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**Transcription and Explanation for Educational Website** **Figure Explanation:** The diagram illustrates the exchange of TCP segments between a TCP sender and a TCP receiver over a period of time from t = 1 to t = 18. - **TCP Sender and Receiver:** The diagram shows communication between two computers: the TCP sender on the left and the TCP receiver on the right. - **Time Sequence:** Time progresses from t = 1 to t = 18 along the vertical axis. Each time step shows a communication event. - **Data Segments (Blue Blocks):** Between t = 1 and t = 8, the sender transmits 8 data segments. These are represented by blue blocks labeled "data segment." - **Lost Segments (Red X):** The data segment sent at t = 4 is marked with a red X, indicating it is lost. Similarly, the ACK (acknowledgment) segment sent at t = 7 is also lost. - **ACK Segments (Blue Blocks):** The receiver sends ACK segments back to the sender. They begin sending ACKs from t = 11 after receiving the retransmitted data. **Question and Explanation:** 3.5-2d. **TCP Sequence and ACK Numbers (d):** The problem requires determining the ACK value in the ACK segment sent from the receiver to the sender at t = 10. It states that the sender transmits 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, and 8. The segment at t = 4 is lost, and so is the ACK at t = 7. **Question:** What is the ACK value carried in the receiver-to-sender ACK sent at t = 10? **Options:** - 200 - 100 - 300 - 400 - 3 - None of these other answers. **Answer Explanation:** Since the segment at t = 4 is lost, the receiver will not send an acknowledgment for it until it is retransmitted. Given the typical behavior in TCP protocols, the receiver ACK might reflect the next expected byte. Since the question details do not provide direct sequence numbers, the exact numerical answer isn't deducible from the provided information alone; however, understanding the concept is critical for practical application.
Transcribed Image Text:**Transcription and Explanation for Educational Website** **Figure Explanation:** The diagram illustrates the exchange of TCP segments between a TCP sender and a TCP receiver over a period of time from t = 1 to t = 18. - **TCP Sender and Receiver:** The diagram shows communication between two computers: the TCP sender on the left and the TCP receiver on the right. - **Time Sequence:** Time progresses from t = 1 to t = 18 along the vertical axis. Each time step shows a communication event. - **Data Segments (Blue Blocks):** Between t = 1 and t = 8, the sender transmits 8 data segments. These are represented by blue blocks labeled "data segment." - **Lost Segments (Red X):** The data segment sent at t = 4 is marked with a red X, indicating it is lost. Similarly, the ACK (acknowledgment) segment sent at t = 7 is also lost. - **ACK Segments (Blue Blocks):** The receiver sends ACK segments back to the sender. They begin sending ACKs from t = 11 after receiving the retransmitted data. **Question and Explanation:** 3.5-2d. **TCP Sequence and ACK Numbers (d):** The problem requires determining the ACK value in the ACK segment sent from the receiver to the sender at t = 10. It states that the sender transmits 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, and 8. The segment at t = 4 is lost, and so is the ACK at t = 7. **Question:** What is the ACK value carried in the receiver-to-sender ACK sent at t = 10? **Options:** - 200 - 100 - 300 - 400 - 3 - None of these other answers. **Answer Explanation:** Since the segment at t = 4 is lost, the receiver will not send an acknowledgment for it until it is retransmitted. Given the typical behavior in TCP protocols, the receiver ACK might reflect the next expected byte. Since the question details do not provide direct sequence numbers, the exact numerical answer isn't deducible from the provided information alone; however, understanding the concept is critical for practical application.
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