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Directions: A 3000 km long trunk is used to transmit frames using a Go-Back-N protocol. The propagation speed is 6 μ sec/km and the trunk data rate is 1.5 Mbps. We ignore the time taken to receive the bits in the acknowledgement. Frame size is 64 Bytes.
What is the maximum number of bits of the sequence number?
    Correct answer is '7'. Can you explain this answer?
    Most Upvoted Answer
    Directions: A 3000 km long trunk is used to transmit frames using a Go...
    × 10^5 km/s and the frame size is 1000 bits. The transmission rate is 1 Mbps.

    1. Calculate the total time required for a frame to travel from the sender to the receiver.
    To calculate the total time required for a frame to travel from the sender to the receiver, we need to consider both the transmission time and the propagation time.

    Transmission Time:
    The transmission time can be calculated using the formula: Transmission Time = Frame Size / Transmission Rate.
    In this case, the frame size is 1000 bits and the transmission rate is 1 Mbps (1 million bits per second).
    So, the transmission time = 1000 bits / 1 Mbps = 0.001 seconds.

    Propagation Time:
    The propagation time can be calculated using the formula: Propagation Time = Distance / Propagation Speed.
    In this case, the distance is 3000 km and the propagation speed is 6 × 10^5 km/s (600,000 km/s).
    So, the propagation time = 3000 km / (6 × 10^5 km/s) = 5 seconds.

    Total Time:
    The total time required for a frame to travel from the sender to the receiver is the sum of the transmission time and the propagation time.
    Total Time = Transmission Time + Propagation Time = 0.001 seconds + 5 seconds = 5.001 seconds.

    Therefore, it takes approximately 5.001 seconds for a frame to travel from the sender to the receiver.

    2. Calculate the maximum number of frames that can be in transit at any given time.
    The maximum number of frames that can be in transit at any given time is determined by the window size of the Go-Back-N protocol. The window size represents the maximum number of unacknowledged frames that can be sent by the sender before waiting for acknowledgments.

    The window size can be calculated using the formula: Window Size = (Propagation Time / Transmission Time) + 1.
    In this case, the propagation time is 5 seconds and the transmission time is 0.001 seconds (calculated in question 1).
    So, the window size = (5 seconds / 0.001 seconds) + 1 = 5001.

    Therefore, the maximum number of frames that can be in transit at any given time is 5001.
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    Community Answer
    Directions: A 3000 km long trunk is used to transmit frames using a Go...
    Propagation time, TP = 6 μ sec/km × 3000 km = 18 ms
    Speed = 1.5 Mbps
    Transmission time for a frame, Tf = 64 byte × 8/1.5 Mbps
    = 0.3 ms
    Total transmission time for a frame and its acknowledgement,
    TF = 2 × TP + Tf
    TF = 2 × 18 ms + 0.3 ms = 36.3 ms
    Size of window = 36.3/0.3 = 121
    Hence, 27 = 128 > 121, so the maximum numbers of bits for the sequence is 7.
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    Directions: A 3000 km long trunk is used to transmit frames using a Go-Back-N protocol. The propagation speed is 6 μ sec/kmand the trunk data rate is 1.5 Mbps. We ignore the time taken to receive the bits in the acknowledgement. Frame size is 64 Bytes.What is the maximum number of bits of the sequence number?Correct answer is '7'. Can you explain this answer?
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    Directions: A 3000 km long trunk is used to transmit frames using a Go-Back-N protocol. The propagation speed is 6 μ sec/kmand the trunk data rate is 1.5 Mbps. We ignore the time taken to receive the bits in the acknowledgement. Frame size is 64 Bytes.What is the maximum number of bits of the sequence number?Correct answer is '7'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 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 Directions: A 3000 km long trunk is used to transmit frames using a Go-Back-N protocol. The propagation speed is 6 μ sec/kmand the trunk data rate is 1.5 Mbps. We ignore the time taken to receive the bits in the acknowledgement. Frame size is 64 Bytes.What is the maximum number of bits of the sequence number?Correct answer is '7'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: A 3000 km long trunk is used to transmit frames using a Go-Back-N protocol. The propagation speed is 6 μ sec/kmand the trunk data rate is 1.5 Mbps. We ignore the time taken to receive the bits in the acknowledgement. Frame size is 64 Bytes.What is the maximum number of bits of the sequence number?Correct answer is '7'. Can you explain this answer?.
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