Given data: Size of file = 100 KB We know that: 1 KB = 1024 Bytes Therefore, 100 KB = 100 × 1024 = 102400 Bytes Payload size = 100 Bytes Window size = 300 Bytes = 3 data packets (100 Bytes = 1 data packet) Number of acknowledgements received by sender = 1500 To find: Byte that is send next. Solution: Finding next byte to send: Unacknowledged data packets = 2 Number of acknowledgements received by sender = 1500 Payload size = 100 Bytes The next byte is determined by adding the number of acknowledgements received by sender and the payload size that is added with the unacknowledged packets. N e x t b y t e = a c k n o w l e d g e m e n t s r e c e i <

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Chapter 12, Problem 13E

a.

Explanation of Solution

Given data:

Size of file = 100 KB

We know that:

1 KB = 1024 Bytes

Therefore, 100 KB = 100 × 1024 = 102400 Bytes

Payload size = 100 Bytes

Window size = 300 Bytes = 3 data packets (100 Bytes = 1 data packet)

Number of acknowledgements received by sender = 1500

To find: Byte that is send next.

Solution:

Finding next byte to send:

Unacknowledged data packets = 2

Number of acknowledgements received by sender = 1500

Payload size = 100 Bytes

The next byte is determined by adding the number of acknowledgements received by sender and the payload size that is added with the unacknowledged packets.

Next byte= acknowledgements recei<

b.

Explanation of Solution

Given data:

Size of file = 100 KB

We know that:

1 KB = 1024 Bytes

Therefore, 100 KB = 100 × 1024 = 102400 Bytes

Payload size = 100 Bytes

Window size = 300 Bytes = 3 data packets

Number of acknowledgements received by sender = 1500

To find: Last Byte

Solution:

Finding the last byte that is sent without an acknowledgement:

Data packets = 3

Number of acknowledgements received by sender = 1500

Payload size = 100 Bytes

The last byte is determined by adding the number of acknowledgements received by sender and the payload size that is added with the unacknowledged packets that is finally subtracted by 1. The value “1” is subtracted in order to get the last byte of the previous data packet.

Last byte=acknowledgements received byx

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