AIT Chapter 6 Internet of Things
Questions about the lecture 'Advanced Internet Technology' of the RWTH Aachen Chapter 6 Internet of Things
Questions about the lecture 'Advanced Internet Technology' of the RWTH Aachen Chapter 6 Internet of Things
Set of flashcards Details
| Flashcards | 48 |
|---|---|
| Language | English |
| Category | Computer Science |
| Level | University |
| Created / Updated | 05.02.2017 / 03.10.2018 |
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What are the characteristics of the architectural style for communicating with services regarding CoRE? [5]
1. Client/server paradigm (based on HTTP get/put/post/delete)
2. Stateless communication (as HTTP provides)
3. Caching on client side (as HTTP allows)
4. Uniform interfaces
5. E.g. the web
Why can’t HTTP/TCP be used for CoRE? [3]
1. Huge protocol stack
2. Lot of OH
3. Retransmission of TCP not suitable due to lossy links
What does CoAP stand for in IoT?
Constrained application protocol
What are the characteristics of CoAP? [6]
1. RESTful protocol
2. Synchronous and asynchronous
3. Specialized on M2M applications
4. Easy translation to/from HTTP
5. No replacement for or general HTTP compression
6. Not separate from web
What are the characteristics of the transaction model in CoAP? [3]
1. Lightweight transport as CoAP is defined for UDP
2. Messaging with CON NON ACK and RST
3. REST
What are the characteristics of resource discovery with CoRE link format in CoAP? [8]
1. Web linking as per RFC 5988
2. Discover links hosted by CoAP servers
3. ‘GET /.well-known/core’
4. Returns link-header style format
5. Timeout if no ACK to a CON message
6. Observation after first CON message, notify sender about change
7. Block transfer with size and flag
8. Use proxy before server to reduce network load
What does the link-header style format for resource discovery with CoRE link format in CoAP consists of? [5]
1. URL
2. Relation
3. Type
4. Interface
5. Content-type
What are further aspects of IoT? [2]
1. Cloud, fog computing for storing/processing sensor data
2. SDN for configuring Internet paths
