問81
頻出度★★★
IoT システム向けに使われる無線ネットワークであり, 一般的な電池で数年以上の運用が可能な省電力性と, 最大で数十 km の通信が可能な広域性を有するものはどれか。
令和元年度 秋期 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 ア 'LPWA' is correct. LPWA stands for 'Low Power Wide Area', and as the name indicates, it is a general term for IoT-oriented wireless communication methods that achieve both low power consumption (Low Power) and wide-area coverage (Wide Area). It features low power consumption that allows several years or more of operation on ordinary batteries, and long-distance communication reaching a maximum of several tens of kilometers, making it suitable for deploying large numbers of IoT devices such as sensors over a wide area. Because it exactly matches the two conditions the question lists — 'operation on batteries for several years' and 'wide-area coverage of tens of kilometers' — ア is correct.
Incorrectイ
MDM (Mobile Device Management) is a mechanism for centrally managing, configuring, and applying security controls to mobile devices such as smartphones and tablets; it is not a wireless network communication method. It has nothing to do with low power consumption or wide-area communication over tens of kilometers.
Incorrectウ
SDN (Software-Defined Networking) is a technology that flexibly handles the configuration and routing control of network devices through software; it is mainly a concept used in wired network operations such as in data centers. It is not an IoT-oriented low-power, wide-area wireless communication method.
Incorrectエ
WPA2 (Wi-Fi Protected Access 2) is an encryption and authentication security standard for wireless LAN (Wi-Fi); it is not a type of communication network itself. In addition, the communication range of Wi-Fi is only about several tens of meters, so it does not satisfy wide-area coverage of tens of kilometers.
ここがポイント
- LPWA = Low Power (low power consumption, several years on a battery) + Wide Area (wide coverage, tens of kilometers), an IoT-oriented wireless communication method. The literal translation of the name directly expresses its characteristics.
- Distinguishing confusing abbreviations: MDM = mobile device management, SDN = software-based network control, WPA2 = wireless LAN encryption standard. None of them is a 'low-power, wide-area IoT wireless' network.
用語