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Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?
Correct answer is '4'. Can you explain this answer?
Verified Answer
Consider the slow start phase for a congestion control in a TCP connec...
Start ⇒⇒4 MSS
Window size after first transmission = 8 MSS
Window size after second transmission = 16 MSS
Window size after third transmission = 32 MSS
Window size after fourth transmission = 36 MSS
Most Upvoted Answer
Consider the slow start phase for a congestion control in a TCP connec...
Understanding TCP Slow Start Phase
In TCP congestion control, the slow start phase is crucial for managing network traffic. During this phase, the transmission window size increases rapidly until it hits a predefined threshold.
Initial Conditions
- Starting Window Size: 4 MSS (Maximum Segment Size)
- Threshold: 36 MSS
Slow Start Mechanism
- The slow start phase begins with a small congestion window.
- For each acknowledgment (ACK) received, the congestion window size increases exponentially.
- Initially, the window size is set to 4 MSS.
Window Size Growth
- First Transmission: The window starts at 4 MSS.
- Subsequent Transmissions: For every round-trip time (RTT):
- Window size doubles (exponential growth).
- After the first RTT, it becomes 8 MSS.
- After the second RTT, it becomes 16 MSS.
- After the third RTT, it becomes 32 MSS.
Threshold Limit Reached
- The window size continues to grow until it reaches the threshold of 36 MSS.
- The first instance when the window size is less than or equal to the threshold is at 32 MSS.
- However, it does not exceed the threshold until the next RTT.
Conclusion
- The transmission window size reaches the threshold limit of 36 MSS in the next transmission after hitting 32 MSS.
- Therefore, the correct answer, where the window size first reaches the threshold limit, is indeed at 4 MSS, as it is the starting point of the slow start phase.
This illustrates the fundamental operation of TCP's slow start feature in managing congestion effectively.
In TCP congestion control, the slow start phase is crucial for managing network traffic. During this phase, the transmission window size increases rapidly until it hits a predefined threshold.
Initial Conditions
- Starting Window Size: 4 MSS (Maximum Segment Size)
- Threshold: 36 MSS
Slow Start Mechanism
- The slow start phase begins with a small congestion window.
- For each acknowledgment (ACK) received, the congestion window size increases exponentially.
- Initially, the window size is set to 4 MSS.
Window Size Growth
- First Transmission: The window starts at 4 MSS.
- Subsequent Transmissions: For every round-trip time (RTT):
- Window size doubles (exponential growth).
- After the first RTT, it becomes 8 MSS.
- After the second RTT, it becomes 16 MSS.
- After the third RTT, it becomes 32 MSS.
Threshold Limit Reached
- The window size continues to grow until it reaches the threshold of 36 MSS.
- The first instance when the window size is less than or equal to the threshold is at 32 MSS.
- However, it does not exceed the threshold until the next RTT.
Conclusion
- The transmission window size reaches the threshold limit of 36 MSS in the next transmission after hitting 32 MSS.
- Therefore, the correct answer, where the window size first reaches the threshold limit, is indeed at 4 MSS, as it is the starting point of the slow start phase.
This illustrates the fundamental operation of TCP's slow start feature in managing congestion effectively.
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Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer?.
Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. At which transmission window size reached the threshold limit?Correct answer is '4'. Can you explain this answer?.
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