Question 36

Let's evaluate each technology for its range:

1. Closed-circuit Television (CCTV): While CCTV systems can be networked over long distances, the cameras themselves and their immediate connections to recorders often involve short-range cabling or localized wireless links. The primary function of a CCTV system is typically local monitoring within a defined, relatively small area (e.g., building, parking lot), making it a short-range technology in its typical deployment.

2. Radio Frequency Identification (RFID): RFID systems use electromagnetic fields to automatically identify and track tags attached to objects. The range for RFID is generally short, from a few centimeters (for NFC-like applications) to several meters, depending on the frequency and power of the reader and tag type. It is inherently a short-range technology.

3. Wireless Local Area Network (WLAN): WLAN, commonly known as Wi-Fi, is designed to provide wireless internet access or network connectivity over a limited geographical area, such as a home, office, or public hotspot. Its range is typically tens to hundreds of meters, classifying it as a short-range communication technology compared to cellular networks or satellite communication.

All three technologies are indeed considered short-range devices or technologies in their common applications and definitions.