What is the spacing between ZigBee channels when operating in the 2.4 GHz frequency band?
Answer : C
ZigBee Channel Spacing:ZigBee channels in the 2.4 GHz band are spaced 5 MHz apart. This helps manage interference in the crowded 2.4 GHz spectrum.
Question 2
You must plan for encryption in a wireless solution deployment. What type of data should always be encrypted? (Choose the single best answer.)
Answer : A
Most Vulnerable In Transit:Sensitive data (passwords, health information, etc.) is most susceptible to interception while being sent over a wireless network. Encryption is crucial at this stage.
Encryption at Rest and in Memory:While also important, these are often handled with different cryptographic techniques depending on the system.
Wireless Security Protocols:Details on encryption standards like WPA2/WPA3, TLS that focus on protecting data during transmission.
Question 3
In the simplified three-layer model for wireless IoT, what is the universal primary function of the Perception layer?
Answer : A
Perception Layer:The foundation of an IoT system, it consists of sensors and actuators that:
Sense:Collect data about the environment or object being monitored.
Actuate:Potentially make changes based on commands (e.g., a smart valve opening/closing).
Transmit:Send gathered data to upper layers for processing.
Question 4
You have been asked to consider smart building opportunities for your organization. Which one of these is a benefit of smart building technology?
Answer : B
Smart Building Core Benefit:Smart building technologies primarily aim to optimize a building's operational efficiency through automation and data-driven insights.
Efficiency Examples:
Energy Management:Automated lighting and HVAC control based on occupancy and environmental conditions.
Maintenance:Predictive maintenance through IoT sensors reduces downtime.
Space Utilization:Optimization of space allocation based on real-time usage patterns.
What is the primary difference between LoRa and LoRaWAN
Answer : B
LoRa:This refers to the underlying radio modulation technique using Chirp Spread Spectrum (CSS). It defines how data is physically encoded onto the wireless signal.
LoRaWAN:This is the network protocol built on top of LoRa. It manages device communication, network topology, and aspects like security. It operates at the MAC sublayer of the Data Link layer (Layer 2) of the OSI model
LoRa vs. LoRaWAN:Key takeaway is that LoRa is the physical layer technology, while LoRaWAN adds the networking layer for management.
LoRa Modulation:Technical explanations of Chirp Spread Spectrum (CSS).
LoRaWAN Specification:Official documentation detailing the network architecture and MAC layer functions.
OSI Model:Descriptions of the Data Link layer and its role in networking.
Question 7
What is the most common difference between a single board computer (SBC) and a controller board?
Answer : A
SBCs (Single Board Computers):Designed as standalone, small-form-factor computers. They often include:
Display Interfaces:HDMI, DisplayPort, etc.
Input Connections:USB for keyboards, mice, etc.
General Purpose Functionality:Can run a full operating system for wider applications.
Controller Boards:Focus on controlling specific hardware or systems.
Limited direct I/O:Limited connectors for displays/input devices.
Specialized tasks:Designed for embedded applications within larger systems.
All Official Question Types