JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III FUNDAMENTALS OF INTERNET OF THINGS Previous Question Paper (August - 2022 - R18)

The Internet of Things (IoT) is defined by several core characteristics that enable the interconnection of physical devices. These include Connectivity, which ensures devices can communicate over networks; Intelligence, provided by embedded sensors and data processing capabilities; Scalability, allowing the network to handle a vast number of devices; Dynamic Nature, where devices can join or leave the network; and Security, which is critical for protecting data integrity and privacy.

Key applications of IoT span across various sectors:

• Smart Homes: Automation of lighting, climate control, and security systems.
• Industrial IoT (IIoT): Predictive maintenance, supply chain optimization, and remote monitoring of factory equipment.
• Healthcare: Remote patient monitoring, wearable health trackers, and asset management in hospitals.
• Smart Cities: Intelligent traffic management, waste management, and energy-efficient street lighting.
• Agriculture: Precision farming using soil moisture sensors and automated irrigation systems.

Application layer protocols in IoT are responsible for data exchange between devices and the cloud or servers. The most prominent protocols include:

• MQTT (Message Queuing Telemetry Transport): A lightweight publish-subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks. It operates over TCP/IP and is ideal for real-time sensor data transmission.
• CoAP (Constrained Application Protocol): A specialized web transfer protocol for use with constrained nodes and networks. It uses UDP to minimize overhead and is designed to easily translate to HTTP for integration with the web.
• HTTP/REST: A standard web protocol used for request-response communication. While it is resource-heavy, it is widely used in IoT for configuration and management tasks due to its simplicity and ubiquity.
• AMQP (Advanced Message Queuing Protocol): An open standard protocol that supports reliable messaging and complex routing. It is often used in enterprise-grade IoT applications where high security and message reliability are required.
• XMPP (Extensible Messaging and Presence Protocol): Primarily used for real-time communication and presence information, it is often employed in IoT scenarios requiring instant messaging or chat-like interactions between devices.