令和8年度 ITパスポート試験問76

This question's explanation and your answers so far.

問76

頻出度★★★

IoT デバイスで用いられる LPWA に関する次の記述中の a, b に入れる字句の適切な組合せはどれか。 LPWA に分類される無線通信方式の特徴は, 通信可能な範囲が無線 LAN に比べて [ a ], 消費する電力が第4世代移動通信規格 (4G) に比べて [ b ]。

出典　令和8年度 ITパスポート試験問76

解説

問 76

Incorrectア
This makes a “narrow” and b “large”, both of which are wrong. LPWA is Wide Area, so its communication range is wider than a wireless LAN; and being Low Power, its power consumption is smaller than 4G, so this description is completely reversed.
Incorrectイ
Although b being “small” is correct, making a “narrow” is wrong. LPWA is a method that covers a wide area, so compared with a wireless LAN its communicable range should be “wide”.
Incorrectウ
Although a being “wide” is correct, making b “large” is wrong. The greatest feature of LPWA is its low power consumption, so compared with 4G its power consumption should be “small”.
エ
正解 The correct answer is エ. LPWA stands for “Low Power Wide Area”, and as the name suggests, it is a wireless communication method for IoT that achieves both “low power consumption” and a “wide area”. Blank a is a comparison with a wireless LAN: a wireless LAN reaches only about tens to a bit over a hundred meters, whereas LPWA can communicate over a range of several hundred meters to tens of kilometers, so its communicable range is “wide” (wider). Blank b is a comparison with the 4th-generation mobile communication standard (4G): LPWA greatly reduces the power it consumes at the cost of a lower communication speed, allowing operation for several years on a single battery. Therefore a is “wide” and b is “small”, so the combination エ is appropriate.

ここがポイント

LPWA (Low Power Wide Area), as its name indicates, is an IoT wireless method characterized by “low power consumption” and “wide-area communication”; it has a low communication speed but a long reach and can run on a battery for a long time.
Get the direction of the comparison right. The advantages of LPWA are that its communication range is “wide” (wider) than a wireless LAN and its power consumption is “small” (less) than 4G.

用語

解答問76エ