ITPEC IP October 2023 Question 87
Which of the following is a technology that is defined by some international standards and used for contactless IC cards, such as tickets for public transport?
Explanation
RFID — radio-frequency identification, the technology inside contactless IC cards such as transport tickets.
A contactless IC card holds a chip and an antenna. When the card is held near the reader, the reader's radio field powers the chip, and the two exchange data by radio without contact. The card's radio interface is defined by international standards such as ISO/IEC 14443 and NFC, so cards and gates from different makers work together.
Answer (b)
Why not others:
- •(a) IrDA — infrared communication between devices, which needs a line of sight between the ports; it is not used for IC cards
- •(c) Bluetooth — short-range radio for connecting devices such as headsets, keyboards and phones, with pairing; not a card technology
- •(d) Wi-Fi — wireless LAN (IEEE 802.11) that connects computers to a network
Key rule: RFID reads chips (tags, IC cards) by radio at close range, and the passive chip is powered by the reader; Bluetooth and Wi-Fi connect powered devices to each other or to a network.
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