OSI MODEL
The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network. It was the first standard model for network communications, adopted by all major computer and telecommunication companies in the early 1980s.
Open system interconnect (OSI) was developed by the international organization for
standardization (ISO) and introduced in 1984.
▪ It’s a consists of seven layers
▪ Application layer, Presentation layer, Session layer, Transport layer, Network layer,
Data link layer, Physical layer.
Advantages of OSI Model
The OSI model helps users and operators of computer networks:
- Determine the required hardware and software to build their network.
- Understand and communicate the process followed by components communicating across a network.
- Perform troubleshooting, by identifying which network layer is causing an issue and focusing efforts on that layer.
The OSI model helps network device manufacturers and networking software vendors:
- Create devices and software that can communicate with products from any other vendor, allowing open interoperability
- Define which parts of the network their products should work with.
- Communicate to users at which network layers their product operates – for example, only at the application layer, or across the stack.
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