IPA IP 2026 Question 81
A question IPA Japan published in 令和8年度 ITパスポート試験 公開問題 問81, translated into English. ITPEC is based on the same exams.
Which of the following is included in the Bluetooth standard and achieves power-saving communication between devices?
Explanation
BLE (Bluetooth Low Energy) — the low-power part of the Bluetooth standard, used between nearby devices.
BLE was added to the Bluetooth specification (version 4.0) for devices that send small amounts of data and must run for months or years on a coin battery: fitness trackers, smartwatches, beacons, sensors. It keeps Bluetooth's short range (about tens of metres) but cuts power use by sleeping between short bursts of communication.
Answer (a)
Why not others:
- •(b) LPWA — Low Power Wide Area is also power-saving, but it is a separate family of wide-area IoT networks (such as LoRaWAN and NB-IoT) that reach several to tens of kilometres; it is not part of Bluetooth
- •(c) LTE — a mobile phone (4G) communication standard, not Bluetooth and not aimed at power saving between devices
- •(d) PLC — Power Line Communication sends data over electric power lines; it is a wired method unrelated to Bluetooth
Key rule: For IoT links, BLE = short range, low power, part of Bluetooth; LPWA = long range (kilometres), low power, low data rate; LTE/5G = mobile networks; PLC = data over power lines.
Networks · AI-written, may contain errors
This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.