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Survey on IoT Application Layer Protocols

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Questions and Answers

What is the main difference between HTTP and CoAP protocols?

CoAP is designed for Machine to Machine (M2M) applications, while HTTP is not. (correct)
HTTP is designed for use with constrained nodes and networks, while CoAP is not.
HTTP is a lightweight RESTful (HTTP) interface, while CoAP is not.
CoAP is a session layer protocol, while HTTP is not.

What is the basis of the Client-Server interaction in CoAP?

The Client-Server interaction is asynchronous over a datagram oriented transport protocol such as TCP.
The Client-Server interaction is synchronous over a datagram oriented transport protocol such as TCP.
The Client-Server interaction is asynchronous over a datagram oriented transport protocol such as UDP. (correct)
The Client-Server interaction is synchronous over a datagram oriented transport protocol such as UDP.

What is the purpose of CoAP's Representational State Transfer (REST) interface?

To enable high-power sensors to use RESTful services while meeting their power constraints.
To provide a lightweight RESTful (HTTP) interface for high-power sensors.
To enable low-power sensors to use RESTful services while meeting their power constraints. (correct)
To provide a heavyweight RESTful (HTTP) interface for low-power sensors.

What is the difference between CoAP's confirmable and non-confirmable modes?

Confirmable mode requires acknowledgment from the receiver, while non-confirmable mode does not. (D) Signup and view all the answers

What is the main advantage of using CoAP over HTTP for IoT applications?

CoAP has a smaller overhead and power consumption compared to HTTP. (B) Signup and view all the answers

What is the purpose of CoAP in the context of the Internet of Things (IoT)?

CoAP is a protocol designed for Machine to Machine (M2M) applications in IoT. (A) Signup and view all the answers

What is the main disadvantage of using HTTP for IoT applications?

HTTP is not designed for use with constrained nodes and networks. (D) Signup and view all the answers

What is the main advantage of using CoAP's asynchronous Client-Server interaction?

It enables low-power sensors to communicate with each other while meeting their power constraints. (C) Signup and view all the answers

What is the main disadvantage of using CoAP's non-confirmable mode?

It does not provide reliable communication between devices. (D) Signup and view all the answers

What is the main purpose of CoAP's datagram oriented transport protocol?

To provide unreliable communication between devices with a small overhead. (B) Signup and view all the answers

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