Question
Consider the following communication technologies:
1. Closed-circuit Television
2. Radio Frequency Identification
3. Wireless Local Area Network
Which of the above are considered communication Short-Range devices/technologies?
Correct Answer — D
Explanation
Correct answer: (d) 1, 2 and 3
Short-Range Devices (SRDs) are wireless transmitters operating at low power over restricted local areas:
CCTV — uses short-range wireless transmitters/local wireless data links.
RFID — communicates wirelessly over centimetres-to-metres for inventory tracking and access control.
WLAN/Wi-Fi — provides localised, high-speed data transmission within a limited physical space.
All three qualify as short-range technologies.