Which technology is designed for short-range data exchange between devices using radio waves?

Which technology is designed for short-range data exchange between devices using radio waves?

• A. Wireless
• B. Bluetooth
• C. NFC
• D. SFP

Answer: (B)

This question tests understanding of short-range wireless technologies used for direct device-to-device data transfer. Bluetooth is designed specifically for exchanging data between nearby devices, forming personal area networks and supporting file transfers, audio streaming, peripherals, and other quick data exchanges over a short distance. It operates in the 2.4 GHz ISM band and is built for regular, user-friendly connections between everyday devices. NFC also uses radio waves but is intended for ultra-short proximity interactions, like tapping two devices to initiate a connection or complete a transaction, rather than general data exchange. SFP is a transceiver used in networking equipment for fiber or copper connections and is not a wireless technology. The broad term wireless could describe many things, but it doesn’t specify the practical short-range data-exchange capability that Bluetooth provides.

This question tests understanding of short-range wireless technologies used for direct device-to-device data transfer. Bluetooth is designed specifically for exchanging data between nearby devices, forming personal area networks and supporting file transfers, audio streaming, peripherals, and other quick data exchanges over a short distance. It operates in the 2.4 GHz ISM band and is built for regular, user-friendly connections between everyday devices.

NFC also uses radio waves but is intended for ultra-short proximity interactions, like tapping two devices to initiate a connection or complete a transaction, rather than general data exchange. SFP is a transceiver used in networking equipment for fiber or copper connections and is not a wireless technology. The broad term wireless could describe many things, but it doesn’t specify the practical short-range data-exchange capability that Bluetooth provides.