VDV Wireless Technology 4

Question 1

Which wireless protocol operates in the 900 MHz band and is commonly used for long-range IoT sensor networks?

Accepted Answer

LoRaWAN

Answer

LoRaWAN uses 915 MHz (in the US) and is designed for low-power, long-range IoT applications spanning many miles.

Question 2

In 802.11 networks, what is the purpose of the RTS/CTS mechanism?

Accepted Answer

To reserve the wireless medium before transmitting large frames, reducing collisions

Answer

RTS/CTS (Request to Send/Clear to Send) is a collision avoidance mechanism that reserves the channel before large frame transmissions.

Question 3

What is the typical frequency range of Bluetooth Classic technology?

Accepted Answer

2.400 GHz – 2.4835 GHz

Answer

Bluetooth Classic and Bluetooth Low Energy (BLE) both operate in the 2.4 GHz ISM band from 2.400 to 2.4835 GHz.

Question 4

A VDV technician needs to connect a building's access points back to a central switch without running cables through the ceiling. Which technology is most appropriate?

Accepted Answer

Wireless mesh networking

Answer

Wireless mesh networking allows APs to backhaul traffic wirelessly to each other and ultimately to a wired uplink point.

Question 5

What is the maximum transmission power typically allowed for 2.4 GHz Wi-Fi in the United States per FCC Part 15 rules?

Accepted Answer

100 mW (20 dBm)

Answer

FCC Part 15 limits 2.4 GHz WLAN transmitter output to 1 W (30 dBm), but with antenna gain the EIRP is limited to 4 W; typical device limits are 100 mW (20 dBm).

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Wireless Technology 4