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TCP sender has sent eight segments each contains 500 data bytes the sequence number in the 1st segment is 5000 determine?

(i) the value of the acknowledgement number and (ii) the list of blocks in the selective acknowledgements option that would be sent by the tcp receiver in response to the following separate cases: 1- The first segments are received but the last four segments are lost 2- The 1st segment is lost but the remaining segments are received 3- The 1st, 3rd, 5th and 7th segments are received but the 2nd, 4th, 6th, and 8th segments are lost.

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hdhd8314

Lvl 2
2y ago
Updated: 9/3/2023

In order to determine the sequence number of the first segment, we need to understand a few key concepts related to TCP (Transmission Control Protocol) and its role in data transmission.

TCP uses sequence numbers for accurate and reliable delivery of data. These numbers help in identifying the order in which segments are sent and received. Each segment contains a specific amount of data bytes, which can vary depending on factors such as network conditions or congestion.

Given that the TCP sender has sent eight segments, each containing 500 data bytes, we can assume that these segments are being transmitted consecutively without any loss or duplication. This means that there is no gap between the sequences.

To find out the sequence number of the first segment, we should deduct one from the product obtained by multiplying 500 (the number of data bytes per segment) with seven (the total number of preceding segments).

Sequence Number = (Number_of_Data_Bytes_Per_Segment * Total_Number_of_Preceding_Segments) + Initial_Sequence_Number

Here's how we calculate it:

Sequence Number = (500 * 7) + Initial_Sequence_Number

Since it was not mentioned what value should be assigned to "Initial_Sequence_Number," let's assume it is zero for simplicity purposes:

Sequence Number = (500 * 7) + 0

= 3500

Therefore, if our assumption about "Initial_Sequence_Number" being zero holds true, then based on sending eight consecutive segments with each carrying 500 data bytes, we can conclude that the sequence number in the first segment is likely to be "3500". However, please note that this calculation assumes no packet losses or retransmissions have occurred during transmission.

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Krishna Soni

Lvl 4
2y ago

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