OSI Seven Layer Model
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OSI (Open Systems Interconnect)
The seven layers are (from to top down),
7. Application
Provide services to the programs that the users themselves can see.
6. Presentation
Presents data from a sending system in a format the the applications on a receiving system can understand.
5. Session
Performs name recognition and security. Manages connections between machines on network.
4. Transport
Has to do with fragmentation & defragmentation, data delivery, & error correction. It also provides end to end communication & control.
3. Network
Routes to information in the network. Determines the route from the source to the destination computer.
2. Data Link
Defines the rules for accesing and using the physical layer. Majority Of functions take place inside NIC.
1. Physical
Dfines the rules for turning the 1's and 0's inot actual electric signals that travel through wires.
Devices and where they fit in the OSI Layers
Hubs...Physical layer 1
Switches...Data layer 2
Bridges...Data layer 2
Routers...Network layer 3
NICs...Physical layer 1
WAPs...Physical layer 1 & Data layer2
[edit section] Remembering The OSI Model
A good way to remember is:
All People Seem To Need Data Processing
[edit section] See Also
OSI Tutorial : OSI tutorial from ProProfs A+ School
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[edit section] Page Credits
Page Conceptualized By: spy1954
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