Which wireless technology creates a personal area network and operates around 2.4 GHz?

Which wireless technology creates a personal area network and operates around 2.4 GHz?

• A. Infrared Data (IrDA)
• B. Bluetooth
• C. Radio Frequency Identification (RFID)
• D. Near Field Communication (NFC)

Answer: (B)

This question tests which wireless technology forms a personal area network and operates around 2.4 GHz. Bluetooth is designed to connect nearby devices into a personal area network, typically within about 10 meters, using the 2.4 GHz ISM band and frequency-hopping spread spectrum to minimize interference. It supports devices like headphones, keyboards, and phones through piconets and can link several devices in a structured way. Infrared Data (IrDA) relies on line-of-sight infrared and doesn’t use radio waves, so it isn’t a PAN and operates differently. RFID is used mainly for identification and asset tracking rather than forming a network of devices. NFC operates at 13.56 MHz and is intended for very short, near-field communications, not at 2.4 GHz. Bluetooth best fits the description.