(SEM VI) THEORY EXAMINATION 2023-24 IOT ARCHITECTURE AND PROTOCOLS

IOT ARCHITECTURE AND PROTOCOLS – KOT601

Section-wise Important Questions & Ready Answers

SECTION A

(Attempt all questions in brief – 2 marks each)

(a) XaaS in the Context of IoT

XaaS stands for Everything as a Service. In IoT, it refers to delivering IoT functionalities such as sensing, data storage, analytics, and device management as cloud-based services accessible over the internet.

(b) Meaning of M2M

M2M stands for Machine-to-Machine communication. It refers to direct communication between devices without human intervention, enabling automated data exchange and control.

(c) Popularity of Hardware in IoT Design

Hardware is becoming popular again due to affordable sensors, low-power microcontrollers, embedded platforms like Arduino and Raspberry Pi, and the demand for real-world data acquisition in IoT systems.

(d) Example of Data Representation in IoT

An example of data representation in IoT is JSON format, where sensor data such as temperature and humidity is transmitted in a structured and lightweight text format.

(e) Primary Use of Bluetooth Low Energy (BLE)

BLE is primarily used for short-range, low-power communication between IoT devices such as wearables, fitness trackers, and smart home sensors.

(f) Zigbee Smart Energy Purpose

Zigbee Smart Energy is designed for energy management applications like smart metering, demand response, home energy monitoring, and efficient power usage.

(g) Difference Between TLS and DTLS

TLS works over TCP and ensures reliable communication, while DTLS works over UDP and provides security for delay-sensitive IoT applications such as CoAP-based systems.

(h) CoAP Full Form and Use

CoAP stands for Constrained Application Protocol. It is used in IoT for lightweight communication between constrained devices and supports REST-based interactions.

(i) Broadband Forum (BBF) Protocol for IoT

A protocol associated with the Broadband Forum for IoT is TR-069, used for remote management of connected devices.

(j) Purpose of 6LoWPAN

6LoWPAN enables IPv6 communication over low-power wireless networks by compressing IPv6 headers, making IP connectivity feasible for constrained IoT devices.

SECTION B

(Attempt any three – 10 marks each)

2(a) Role of Local and Wide Area Networking in IoT

Local area networking in IoT supports short-range communication between nearby devices using technologies like Wi-Fi, BLE, Zigbee, and Z-Wave. These networks enable fast data exchange with low latency in homes and industries.
Wide area networking enables long-range communication using technologies such as LPWAN, NB-IoT, LTE-M, and LoRaWAN. WANs support city-wide or global IoT deployments with low power consumption and scalable connectivity.

2(b) Technical Design Constraints in IoT Development

IoT development faces constraints such as limited power supply, restricted memory, low processing capability, bandwidth limitations, security vulnerabilities, and environmental constraints. Designers must optimize energy usage, ensure secure communication, and maintain reliability under constrained conditions.

2(c) Role of PHY/MAC Layer in IoT Communication

The PHY layer manages signal transmission, modulation, and data rates, while the MAC layer handles addressing, collision avoidance, and channel access. Protocols like 3GPP MTC support massive IoT connectivity, and IEEE 802.11 enables high-speed wireless access for IoT devices.

2(d) XMPP in IoT: Strengths and Weaknesses

XMPP is an extensible messaging protocol supporting real-time communication, presence detection, and security. Its strengths include scalability and interoperability, while weaknesses include higher overhead and unsuitability for highly constrained IoT devices.

2(e) Contributions of Open Mobile Alliance (OMA) to IoT

OMA has contributed standards such as OMA-DM and Lightweight M2M (LwM2M) for device management. These standards enable remote provisioning, monitoring, firmware updates, and lifecycle management of IoT devices.

SECTION C

3(a) Importance of Standards in IoT

Standards ensure interoperability, scalability, security, and reliability in IoT systems. Common standards include IEEE 802.15.4, IPv6, MQTT, CoAP, oneM2M, and Zigbee. Standards reduce vendor lock-in and enable global IoT deployment.

3(b) Significance of M2M and IoT Analytics

M2M and IoT analytics transform raw sensor data into actionable insights. Analytics help in predictive maintenance, energy optimization, fault detection, and business decision-making, thereby increasing the overall value of IoT systems.