JSON Fundamentals: JSON (JavaScript Object Notation) is a text-based format for representing data in a structured, yet flexible way. Its key features are:
JSON vs. Other Options
References:
JSON Introduction: Clear definitions and examples of its syntax. (e.g., https://www.json.org/json-en.html)
JSON Data Structures: Explanations of how arrays and nested objects are handled within JSON.
Question 2
What is the primary difference between LoRa and LoRaWAN
Options:
A.
LoRa uses RF and LoRaWAN uses light-based communications
B.
LoRa is the modulation method (using CSS modulation at the Physical Layer) and LoRaWAN is the MAC sub-layer of the Data Link layer
C.
LoRa is the Physical Layer and LoRaWAN is the Transport Layer
D.
LoRa is used for communicating across the Internet and LoRaWAN is used only on the local link
Answer:
B
Explanation:
Explanation:
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.
References:
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 3
How does OFDMA differ from OFDM?
Options:
A.
Subcarriers of OFDMA can contain data destined for a different receiver
B.
OFDMA offers greater range by using multiple channels at once
C.
OFDMA allows multiple devices to transmit simultaneously on the same frequency
D.
OFDMA uses multiple radios to achieve higher throughput