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这是一篇关于mindmap-cosc的思维导图
Edited at 2021-08-03 05:42:12
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- Outline
Introduction
Data
Data Communication
Definition
Exchange of Data
Two devices
Transmission medium
Requirements
DCS
Hardware
Local
Remote
Software
Effectiveness
Delivery
Accuracy
Timeliness
Jitter
Components
Data Flow
Types
Duplex
Half-Duplex
Full-Duplex
Protocols & Standards
Protocols
Rules governing data communication
What is communicated
How it is communicated
When it is communicated
Key elements
Syntax
Structure of format of the data
Semantics
Meaning of each section of bits
Timing
When data should be sent
How fast they can be sent
Standards
Guidlines for manufacturers
Data communication
De facto
By fact/by convention
De jure
By law/by regulation
Network
Definition
Set of devices connected by communication links
Distributed process
Criteria
Security
Performance
Measured
Transit time
Response time
Evaluated
Throughput
Delay
Reliability
Measured
Frequency of failure
Time to recover rom failure
Network's robustness ostustrphe
Fire, earthquake,theft
Protection
Backup,network,Software etc
Accuracy of delivery
Physical structure
Link
Communication pathway that transfers data from one device to another
Types of connections
Point to point
Dedicated link between two devices
Multipoint
Single link can be shared by more than two
Spaciously shared connection
Timeshared connection
Physical topology
Physical layout of the network
Types
Mesh
Star
Bus
Ring
Categories
LAN
Privately owned and links a single office's devices
Size is within few kilometeres
Resources are shared
MAN
Area of a town or city
High end connectivity and have endpoints spread
WAN
Long distance transmission over large geographical areas
Switched WAN
Point to pont WAN
Intranertwork
Two or more networks connected
Connected using routers/gateway
Internet