ITPEC IP October 2023 Question 34
Which of the following is a wireless network that is used for IoT systems, and has power saving properties that enable operation for more than several years with a general battery and wide area properties that enable communication over a maximum distance of tens of kilometers?
Explanation
LPWA — Low Power Wide Area: wireless communication over distances of kilometres to tens of kilometres with very little power, for IoT devices.
LPWA gives up speed: it carries small amounts of data at low rates. In return a sensor can run for years on an ordinary battery and reach a base station far away, which suits devices that send a reading now and then, such as meters and environmental monitors. LoRaWAN, Sigfox and NB-IoT are examples.
Answer (a)
Why not others:
- •(b) MDM — mobile device management, a way to manage a company's smartphones and tablets centrally, not a communication method
- •(c) SDN — software-defined networking, which controls network devices centrally by software; it is not a wireless network
- •(d) WPA2 — the security (encryption) standard for wireless LANs, which reach only tens of metres
Key rule: "IoT, low power, long range, little data" means LPWA; a wireless LAN or 5G is chosen when speed matters.
Networks · AI-written, may contain errors
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