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Recent automobiles are equipped with up-to-date electronic devices to make driving safer and more convenient. An increase in electronic devices leads to an increased amount of wiring in vehicle which in turn results in increased car weight, reduced fuel economy, and increased troubles. To resolve these problems, a vehicle communication network system is being developed. The system can process a massive quantity of data at a high speed by replacing the numerous wires with a few communication lines. To transmit large amounts of data efficiently, the vehicle network system adopts communication protocols suitable for the system's characteristics.