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Questions and Answers
What is the primary function of HTTP in IoT communication?
Communication between devices and web servers
Which mail protocol is used for retrieving email from a mail server?
POP3
What is the main purpose of the RPL routing protocol?
Designed for low-power and lossy networks
What is the function of the Network layer (Layer 3) in the OSI model?
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What is the primary difference between CoAP and HTTP?
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What is the purpose of the Transport layer (Layer 4) in the OSI model?
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Study Notes
IoT Protocols
Web Protocols
- HTTP (Hypertext Transfer Protocol): used for communication between devices and web servers
- CoAP (Constrained Application Protocol): a lightweight, binary protocol for constrained devices and networks
- MQTT (Message Queuing Telemetry Transport): a lightweight, publish-subscribe-based messaging protocol
Mail Protocols
- SMTP (Simple Mail Transfer Protocol): used for sending and receiving email between devices
- POP3 (Post Office Protocol version 3): used for retrieving email from a mail server
- IMAP (Internet Message Access Protocol): used for retrieving and managing email on a mail server
Routing Protocols
- RPL (Routing Protocol for Low-Power and Lossy Networks): a routing protocol designed for low-power and lossy networks
- 6LoWPAN (IPv6 over Low-Power Wireless Personal Area Networks): a routing protocol for low-power wireless networks
- OLSR (Optimized Link State Routing Protocol): a routing protocol for mobile ad-hoc networks
OSI (Open Systems Interconnection) Model
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7 layers:
- Physical (Layer 1): defines physical means of data transmission
- Data Link (Layer 2): provides error-free transfer of data frames
- Network (Layer 3): routes data between devices
- Transport (Layer 4): provides reliable data transfer between devices
- Session (Layer 5): establishes, manages, and terminates connections
- Presentation (Layer 6): converts data into a format understood by the receiving device
- Application (Layer 7): provides services to end-user applications
TCP/IP (Transmission Control Protocol/Internet Protocol) Model
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4 layers:
- Network Access (Link Layer): combines OSI layers 1 and 2
- Internet (Network Layer): equivalent to OSI layer 3
- Transport (Transport Layer): equivalent to OSI layer 4
- Application (Application Layer): combines OSI layers 5, 6, and 7
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Description
Test your knowledge of IoT protocols, including HTTP, CoAP, MQTT, and more, as well as network models such as the OSI and TCP/IP models. Understand the different layers and their functions.
