Consider the following communication technologies: 1. Closed-circuit Television 2. Radio Frequency Identification 3. Wireless Local Area Network Which of the above are considered Short-Range devices/technologies?
Explanation
Out of the listed communication technologies, all three can be considered short-range devices/technologies.
Closed-Circuit Television (CCTV): CCTV systems primarily use cables or wireless connections with a limited range, typically within a building or a designated area.
Radio Frequency Identification (RFID): RFID uses radio waves to identify objects. The reading range of RFID tags depends on the specific technology but generally falls within the short-range category, from a few centimetres to a few meters.
Wireless Local Area Network (WLAN): WLANs, commonly known as Wi-Fi networks, typically operate within a range of tens of meters indoors and up to hundreds of meters outdoors depending on factors like signal strength and frequency band. While the range might be slightly larger than the others on this list, WLANs still fall under the short-range classification compared to technologies like cellular networks or satellite communication.