問66
頻出度★☆☆
NFCに関する記述として, 適切なものはどれか。
平成30年度 秋期 ITパスポート試験 問66
テクノロジ系コンピュータ構成要素 › 入出力デバイス
This question's explanation and your answers so far.
解説
問 66
- ア
正解 The correct answer is ア. NFC (Near Field Communication) is a contactless wireless communication standard whose communication range is limited to a very short distance of about 10 cm, and it is a type of RFID. It is used to read and write data by holding an IC card or IC tag near the reader; typical examples include transit IC cards, electronic money, and smartphone tap-to-pay. Choice ア, “It performs short-range communication over a distance of about 10 cm, and is used to read and write data on IC cards and IC tags,” correctly describes this characteristic.
Incorrectイ
“It can communicate over an area of several tens of meters, and is used for wireless LAN” describes Wi-Fi (wireless LAN). NFC has a communication range of only about 10 cm, which is extremely short and nowhere near several tens of meters. Both the range and the purpose differ, so it is incorrect.
Incorrectウ
“It performs communication using infrared light, and is used for exchanging data between mobile phones, among other purposes” describes IrDA (infrared communication). NFC uses radio waves (electromagnetic induction in the 13.56 MHz band) and does not use infrared light, so it is incorrect.
Incorrectエ
“It can receive radio waves from multiple artificial satellites, and is used for position measurement in car navigation systems” describes GPS (Global Positioning System). NFC is short-range communication between devices and has nothing to do with satellite positioning, so it is incorrect.
ここがポイント
- NFC is a contactless wireless communication standard (a type of RFID) that communicates only over a short range of about 10 cm, and is used for reading and writing IC cards and IC tags as well as for electronic money and tap-to-pay.
- Distinguish wireless technologies by communication range and purpose: NFC (about 10 cm, contactless IC) / Wi-Fi (several tens of meters, wireless LAN) / IrDA (infrared, device-to-device data exchange) / GPS (satellite radio waves, position measurement).
用語