Internet Architecture

Internet Architecture

The International Standards Organization is a multinational body dedicated to worldwide agreement to international standards. ISO standard that covers all aspects of network communication is the Open Systems Interconnection model. It was first introduce in late 1970s. An open system is a set of protocols that allows any two different systems to communicate regardless of their underlying architecture.  Purpose of the OSI model is to show how to facilitate communication between different systems with out requiring changes to the logic of underlying hardware and software. The OSI is a model to understand and design a network architecture that is robust, interoperable and flexible.

The OSI model is made of seven ordered layers

Physical (layer1)

Data link (layer 2)

Network (layer 3)

Transport (layer 4)

Session (layer 5)

Presentation (layer 6)

Application (layer 7)

Organization of layers:

The seven layers belong to three subgroups.

Layer 1, 2 and 3 are the network support layer. They deal with the physical aspects of moving data from one device to another (such as physical connections, electrical specifications, physical addressing and transport timing and reliability)

Layer 5, 6 and 7 can be thought of user support layers. These layers allow interoperability among unrelated software systems.

Layer 4 links the two subgroups and ensures what the lower layers have transmitted is in a form that the upper layers can use.

Upper OSI layers almost always implemented in software lower layers are a combination of hardware and software, except for physical layer which is mostly hardware.


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