令和2年度 ITパスポート試験問70

This question's explanation and your answers so far.

問70

頻出度★★★

LPWAの特徴として, 適切なものはどれか。

出典　令和2年度 ITパスポート試験問70

解説

問 70

Incorrectア
The statement that a computer acquires new knowledge or rules from input data describes machine learning, a technology in the AI field. It has nothing to do with LPWA, which is a wireless communication technology.
イ
正解 The correct answer is イ. As its name suggests, LPWA (Low Power Wide Area) is a wireless communication technology that achieves both low power consumption (Low Power) and wide area coverage (Wide Area), making it suitable for connecting large numbers of IoT devices. Its communication speed is lower than that of mobile phone networks, but in exchange it keeps power consumption low, allowing operation for several years or more on ordinary batteries. It can also cover a wide communication range of up to several tens of kilometers from a single base station. Choice イ correctly describes these LPWA characteristics of low speed, low power, and wide area, so it is appropriate.
Incorrectウ
A distributed ledger, bundling transaction records and embedding the hash value of the immediately preceding data, and making tampering difficult, all describe blockchain. LPWA is a communication technology, not a ledger technology.
Incorrectエ
An encryption method for wireless LAN, recommended in place of the vulnerable WEP, describes WPA (such as WPA2). LPWA is not an encryption method but a wide-area wireless communication technology, and is a separate thing from wireless LAN encryption methods.

ここがポイント

LPWA = Low Power Wide Area. Characterized by low power consumption, wide area, and low speed, it is a wireless communication technology for IoT that runs for several years on batteries and covers up to several tens of kilometers.
The question tests whether you can distinguish LPWA from confusingly similar terms in other fields (machine learning = AI, blockchain = distributed ledger, WPA = wireless LAN encryption).

用語

解答問70イ