What is Internetworking? Internetworking Models.

This blog will help you to understand the basics of internetworking and how to connect the networks using Cisco routers and switches.

The Open Systems Interconnection (OSI) model will be discussed in detail in this Blog. The OSI model has seven layers that were developed to help different companies/Vendors communicate between their disparate systems. It is important to understand the basics of the OSI model as Cisco sees it, and that is how I will present the seven layers of the OSI model to you. By understanding this model, We can effectively build, maintain, and troubleshoot any network. 

This Blog will give you both an introduction to the Cisco three-layer model and the details of each layer. Different types of devices are specified at the different layers of the OSI model. It is important to know the different types of cables and connectors used to connect these devices to the network. 

By understanding the different products available from Cisco, We can understand which devices can meet our business requirements for your network. 

When the networks first came into the picture, That time computers could typically communicate only with computers from the same manufacturer/Vendor. For example, companies ran either a complete DECnet solution or an IBM Computers not both together. 

In the 1970s, the OSI (Open Systems Interconnection
model was created by the International Organization for Standardization (ISO) to break the barrier(Single vendor/Manufacturer communication only). 

That time, the OSI model is the primary architectural model for networks. It describes how the data and network information are communicated from applications on a single computer, through the network, to an application on another computer. The OSI reference model breaks this approach into multiple layers. Cisco has created a three-layer model that is used to help design, implement, and maintain any complex network.

For understanding the three-layer model, We will gain an understanding of how Cisco uses internetworking. Also OSI covers a fundamental understanding of the devices used at each layer of the model, we can effectively design and purchase the correct Cisco equipment to meet our business needs. 

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