Which statement best describes CAN bus in the context of vehicle telemetry?

• A. A vehicle network protocol
• B. A wireless communication standard
• C. A data storage format
• D. A telemetry visualization tool

Answer: (A)

CAN bus is a vehicle network protocol that lets multiple electronic control units talk to each other over a single wired bus. It defines how messages are formatted (frames with an identifier, data length, and payload), how access to the bus is shared so that the highest-priority messages get sent first through arbitration, and how errors are detected and handled to keep communication reliable in the automotive environment. This makes it ideal for telemetry, because you can gather data from many sensors and control modules in real time, even in the presence of electrical noise, on a robust, multi-node network. It’s a wired, multi-master system using a differential pair, not a wireless standard, and it isn’t a data storage format or a visualization tool. In practice, a module might publish engine rpm or speed on the CAN network, while other modules or a data logger listen in or respond as needed.