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Data Communications Network (Reference OSI model: (Physical (Transmission…
Data Communications Network
Different communication networks were developed, depending on the type of signal Concepts:
Data transmission
Data network
This is the way that packets are sended by OSI and TCP/IP protocols:
The message is divided into packets (1500 bytes in
Ethernet) and headers are added.
Upon arrival at the destination they are ordered
Packet Switching
Packages travel on different routes
No resources are taken
Fail a section the packages are sent by another
way
Reference OSI model:
Data Link
Transmission between
adjacent nodes.
Retransmissions Eg:
Ethernet protocol
Network
Route data packets from
source to destination
Determine the most
appropriate route
Physical
Transmission of the bits
Voltage levels
Ex: 10BaseT and 100BaseT
Transport
Route data packets from
source to destination
Ex: Internet protocol (IP)...
Session
Maintain sessions
between nodes
Create, Keep, End up, Resume.
Presentation
Presentation of the
information
Coding, Compression, Encryption.
Application
Emulation of terminals
Ex: FTP protocol, SMTP,
HTTP
Data communication in the OSI model. The data goes through all the layers. In each layer has:
Origin
Destination