Computer Science – Methods of error detection | e-Consult
Methods of error detection (1 questions)
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A sequence number is a numerical value assigned to each data packet sent over the network. It serves a crucial role in ARQ by allowing the receiver to identify and reorder packets that arrive out of sequence.
Here's how it works:
- The sender assigns a unique sequence number to each packet.
- The receiver uses the sequence numbers to reconstruct the original order of the packets.
- If a packet is received out of order, the receiver can store it and request the missing packets from the sender.
- The sender uses the sequence numbers to ensure that the packets are delivered in the correct order. If a packet is lost, the receiver can detect this by noting the gap in the sequence numbers and requesting a retransmission of the missing packet.
Without sequence numbers, the receiver would have no way of knowing the order in which packets were received, leading to data corruption and incorrect data reconstruction. Sequence numbers are therefore essential for reliable data transmission using ARQ.