Bluetooth and Zigbee in Computer Networks - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Differences in Network Topology

Which network topology is primarily used by Zigbee but not by Bluetooth?

A Star topology

B Mesh topology

C Ring topology

D Bus topology

💡 Hint

Think about which technology supports devices relaying messages through other devices.

Zigbee supports mesh topology, allowing devices to pass messages through each other to extend range. Bluetooth typically uses star topology.

📋 Factual

intermediate

Frequency Bands Used

What frequency band do both Bluetooth and Zigbee commonly operate in?

A 900 MHz band

B 5 GHz Wi-Fi band

C 2.4 GHz ISM band

D 60 GHz band

💡 Hint

Consider the common unlicensed band used worldwide for short-range wireless communication.

Both Bluetooth and Zigbee operate primarily in the 2.4 GHz ISM band, which is a globally available unlicensed frequency band.

🔍 Analysis

advanced

Power Consumption Comparison

Which statement best explains why Zigbee is generally preferred over Bluetooth for battery-powered sensor networks?

A Zigbee uses higher data rates which reduce transmission time and save power.

B Bluetooth operates on a lower frequency band which drains batteries faster.

C Bluetooth requires mesh networking which consumes more power.

D Zigbee devices can sleep longer and wake less frequently, reducing power use.

💡 Hint

Think about how devices manage their active and sleep times to save energy.

Zigbee is designed for low power consumption by allowing devices to sleep for long periods and wake only when needed, making it ideal for sensor networks.

❓ Comparison

advanced

Data Rate and Range Differences

Which option correctly compares the typical data rate and range of Bluetooth and Zigbee?

A Bluetooth has higher data rate and shorter range than Zigbee.

B Bluetooth has lower data rate and longer range than Zigbee.

C Zigbee has higher data rate and longer range than Bluetooth.

D Zigbee has lower data rate and shorter range than Bluetooth.

💡 Hint

Consider which technology is optimized for faster data transfer and which for longer battery life and range.

Bluetooth typically offers higher data rates (up to several Mbps) but shorter range (around 10 meters), while Zigbee offers lower data rates (up to 250 kbps) but longer range through mesh networking.

❓ Reasoning

expert

Choosing Technology for a Smart Home System

You are designing a smart home system with many sensors and devices spread across a large house. Which technology would be best and why?

A Zigbee, because its mesh network extends coverage and conserves battery life.

B Bluetooth, because it supports high data rates for streaming video from cameras.

C Bluetooth, because it uses less power than Zigbee for sensor devices.

D Zigbee, because it operates on a licensed frequency band with less interference.

💡 Hint

Think about coverage, power use, and network size for many devices.

Zigbee's mesh networking allows devices to relay messages, extending coverage throughout a large home. It also uses low power, ideal for battery-powered sensors.