OSI Layer [ MUST REMEMBER ]

OSI MODEL [ hell important, MUST REMEMBER! ]

7. Application Away
6. Presentation Pizza
5. Session Sossej
4. Transport Throw
3. Network Not
2. Data link Do
1. Physical Please


PHYSICAL = Binary Transmission
- Wires, connectors, voltages, data rates.

DATA LINK = Direct Link Control, Access to Media
- Provides connectivity between two host.
- No error correction, best effort delivery.

NETWORK = Network Address and Best Path Determination
- Provides reliable transfer of data across media.
- Physical addressing, network topology, error notification,
flow control.

TRANSPORT = End to end connection
- Concerned with transportation issues between host.
- Data transport reliability.
- Establish, maintain, terminate virtual circuit.
- Fault detection and recovery information flow control.

SESSION = Interhost Session
- Establishes, manages and terminates sessions between applications.


PRESENTATION = Data Presentation
- Ensure that the data is readable when receiving the system.
- Format of data.
- Data structures.
- Nagiotates data transfer syntax for application layer.


APPLICATION = Network Processor to Application
- Provides network services to application processes such as
electronic mail, file transfer and terminal emulasion.