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OSI Model
7 layers. (APSTNDP)
7.APPLICATION
6-PRESENTATION
5-SESSION
4-TRANSPOR
3-NETWORK
2-DATA LINK
1-PHYSICAL
Application
interacts with end user. Includes programs on a computer that interact with a network.
Presentation
it’s the coding of data. Includes file formats and character presentation.
******ENCRYPTION TAKES PLACE IN THIS LAYER****
Session
maintains communication sessions between computers. Creates, maintains and disconnects communications that take place between processes over the network.
Transport
Breaks data into packets and properly transmits them over the network.
Network
Logical implementation of the network.
****LOGICAL ADDRESSING***
IN TCP/IP networking, logical addressing takes the familiar form of IP address.
Data Link
responsible for TRANSMITTING INFORMATION on computers connected to the same LAN.
***USES MAC ADDRESSES***
Physical
Must translate the binary ones and zeros of computer language into the language of the transport medium.
Copper network cables
it must translate computer data into ELECTRICAL IMPULSES
Fiber optics
must translate the data into bursts of light