Before moving to our topic “Open Systems Interconnect Model (OSI)“, we will gain some information about the Internet. It was 1st January of 1983, the Advanced Research Projects Agency Network(ARPANET) adopted TCP/IP. This made researchers to assemble a network of networks. The online-world then became the more recognizable in 1990, when computer scientist Tim Berners-Lee invented the World Wide Web. To Know more about Tim Berners-Lee, make a hard hit on the below image.
OSI Model – Brief Introduction
In the beginning, when people were creating the network, there were no rules regarding interconnecting each network. If country A was developing the network and simultaneously country B was too, it might be impossible to interconnect them. This is because there were no common rules for each country to assemble their network that can help them to interconnect their network. To solve this, International Standards Organization developed a proposal. This proposal made The Open Systems Interconnection (OSI) came into existence in 1984.
The Open Systems Interconnection (OSI) Model has the most basic elements of computer networking. The main objective of the OSI model was to provide a full working set of design standards for equipment manufacturers to make them possible to communicate with each other on a common rule. It has a hierarchal structure. This architecture logically partitions functions which are required to support system to system communications.
OSI Model – The Architecture
The Open System Interconnect Model’s architecture is divided into 7 layers. The following are the respective layers:
- Physical Layer
- Data Link Layer
- Network Layer
- Transport Layer
- Session Layer
- Presentation Layer
- Application Layer
If you are mainly concerned about Network Engineer with CCNA, from layer 2 to layer 4 is more important to you. Unless you are from programming area, other layers(layers 5 and layer 6) will be nothing to do with you.
Here, I have found a resource regarding networking fundamentals: HIT ME!
Image Source:- The OSI Model : ProgrammerHumor
If you are eager to know about them all : Visit Here. or
I liked Eli the Computer Guy video. Hope you will be satisfied with the resources mentioned. For video all credits go to Eli the Computer Guy.
I know these all above are not sufficient for your appetite. I will post regarding each layer in enriched details in upcoming posts. Visit again.