Computer Science – Types and methods of data transmission | e-Consult
Types and methods of data transmission (1 questions)
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The sequence number field in the TCP header is critical for reliable data transmission. TCP is a connection-oriented protocol that ensures data is delivered in the correct order and without loss. Here's how the sequence number contributes:
- Data Segmentation: When a large amount of data needs to be sent, TCP divides it into smaller segments. Each segment is assigned a unique sequence number.
- Order Reassembly: At the receiving end, TCP uses the sequence numbers to reassemble the segments into the original data stream in the correct order, even if they arrive out of order.
- Missing Segment Detection: If a segment is lost during transmission, the receiver can detect this by noticing a gap in the sequence numbers. The sender can then retransmit the missing segment.
- Duplicate Segment Detection: If a segment is duplicated (due to network issues), the receiver can use the sequence number to identify and discard the duplicate, ensuring data integrity.
In essence, the sequence number provides a mechanism for TCP to guarantee that data is delivered completely and in the correct sequence, making it a cornerstone of reliable data transfer.