IPA IP 2020 Question 70
A question IPA Japan published in 令和2年度 10月 ITパスポート試験 公開問題 問70, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Apr 2022 Q34
Which of the following is an appropriate characteristic of LPWA?
Explanation
A wide-area wireless network with small power consumption — LPWA (Low Power Wide Area), built for IoT sensors.
LPWA deliberately gives up speed: it sends small amounts of data at low rates, often only a few hundred bit/s to some hundred kbit/s. In return a device can run for years on ordinary batteries and reach a base station several kilometres away. That fits sensors that report a reading now and then, such as meters, environmental monitors or trackers. LoRaWAN, Sigfox and NB-IoT are examples.
Answer (b)
Why not others:
- •(a) — describes machine learning: a computer learns rules from data instead of being programmed with them
- •(c) — describes blockchain: each block holds the hash of the previous one, so tampering shows up as an inconsistency
- •(d) — describes WPA2 (or WPA), the wireless LAN encryption recommended in place of the vulnerable WEP
Key rule: LPWA trades speed for range and battery life; it suits IoT devices sending little data, while a wireless LAN or 5G is chosen when speed matters.
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.