Consider the following communication technologies:1. Closed-circuit Television2. Radio Frequency Identification3. Wireless Local Area NetworkWhich of the above are considered Short-Range devices/ technologies?
✓ Correct answer: d) 1, 2 and 3
ExplanationShort-Range Devices (SRDs) are communication technologies designed for limited-distance operations, typically within a few meters to a few hundred meters.Option 1 is correct: CCTV systems use video cameras to transmit signals to specific monitors for surveillance purposes.The transmission range of CCTV systems is generally confined to the premises being monitored, making them short-range by design.Option 2 is correct: RFID employs electromagnetic fields to automatically identify and track tags attached to objects.They are typically short-range, with passive RFID tags readable from up to a few meters and active tags extending up to 100 meters.Option 3 is correct: WLANs enable wireless network communication within a localized area, such as a home or office, using high-frequency radio waves.The effective range of WLANs is usually within 100 meters, categorizing them as short-range communication technologies.68
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