問81
頻出度★★★
Bluetooth の規格に含まれ, デバイス間の省電力通信を実現させるものはどれか。
令和8年度 ITパスポート試験 問81
テクノロジ系ネットワーク › ネットワーク方式
This question's explanation and your answers so far.
解説
問 81
- ア
正解 The correct answer is ア, BLE. BLE stands for Bluetooth Low Energy, a low-power communication mode that has been part of the Bluetooth standard since Bluetooth 4.0. Instead of staying constantly connected, it exchanges data only briefly when needed, so it is energy-efficient enough to run for months or even years on a button cell battery. For this reason it is widely used for communication between small battery-powered devices such as wearables, sensors, and beacons. Only BLE satisfies both conditions in the question, being included in the Bluetooth standard and achieving low-power communication between devices, so ア is correct.
Incorrectイ
LPWA (Low Power Wide Area) is a general term for wireless communication that connects wide areas on the scale of several kilometers at low speed while keeping power consumption low (such as LoRaWAN and Sigfox). It is similar to BLE in being low-power, but it is not part of the Bluetooth standard; it is a wide-area network technology for IoT, so it is wrong.
Incorrectウ
LTE (Long Term Evolution) is a fourth-generation (4G) high-speed mobile communication standard used in cell phones. It aims at wide-area, high-speed communication through base stations; it is neither part of the Bluetooth standard nor short-range communication focused on saving power, so it is wrong.
Incorrectエ
PLC (Power Line Communication) is a wired technology that uses power lines (the wiring of electrical outlets) as the communication path. It sends data over power cables, has nothing to do with Bluetooth, and is not wireless low-power communication between devices, so it is wrong.
ここがポイント
- BLE (Bluetooth Low Energy) = a low-power communication mode standardized in Bluetooth 4.0, ideal for small battery-powered IoT and wearable devices.
- Distinguishing easily-confused wireless standards: BLE = Bluetooth short-range low-power / LPWA = low-power, wide-area low-speed / LTE = 4G mobile high-speed / PLC = wired communication over power lines.
用語