In a packet-switching system, data messages are split into packets of a fixed size.
A packet will contain:
- The data being sent.
- The address of the source and destination of the data.
- A checksum for the purpose of checking for corrupt files.
- Data which allows the original data to be re-assembled.
The packet data is re-directed by each computer on the network to the next until it arrives at it intended destination.
A single set of data can be split up into a number of packets, each packet may take a different route and may also arrive out of order but are re-assembled at the end.This method is preferred because there is no waiting during gaps and is less likely to be affected by network failure. It also has better security then Circuit Switching.
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