問56
頻出度★★★
Bluetooth に追加された仕様の一つであり, 省電力性に優れているので, IoT システムを長期間運用でき, 送受信デバイス間の距離を知ることにも使われているものはどれか。
令和7年度 ITパスポート試験 問56
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 56
- ア
正解 The correct answer is ア, BLE (Bluetooth Low Energy). BLE is a low-power communication specification added from Bluetooth 4.0 onward; it is so power-efficient that it can run for a long time on just a single coin cell battery. This lets IoT devices such as sensors operate over a long period without battery replacement, and it is also used to estimate the distance between transmitting and receiving devices based on the signal strength of a beacon. Only BLE satisfies all of the conditions listed in the stem: a specification added to Bluetooth, power saving, long-term operation of IoT, and distance measurement.
Incorrectイ
IrDA is a short-range wireless communication standard that uses infrared light; it is not a specification added to Bluetooth. It is a separate type of technology that is highly directional and weak against obstacles, so it does not match the conditions of this question.
Incorrectウ
NFC is a short-range wireless communication standard that communicates over an extremely close range of a few centimeters (used for transit IC cards, payments, etc.). It is not a specification added to Bluetooth, nor is it a technology aimed at distance measurement or long-term IoT operation.
Incorrectエ
PLC (Power Line Communication) is a wired communication technology that uses power lines as the transmission path. It is unrelated to wireless Bluetooth, and it is neither an added specification nor a power-saving distance-measurement technology.
ここがポイント
- BLE (Bluetooth Low Energy) is a low-power specification added in Bluetooth 4.0, used for long-term operation of IoT devices and for distance estimation via beacons.
- IrDA (infrared) and NFC (short-range wireless) are both standards different from Bluetooth, and PLC is wired communication that uses power lines; do not confuse them.
用語