When someone is working on a computer network it is very important for individuals and businesses to understand the nitty-gritty of the computer that they are working on so as to understand the problem in case they happen to meet such incidence. It will also help them interacting with their computer network support professionals and resolving the problem.

It is important to underline here that your remote computer support team is accessing from somewhere else and the only means through which they would be able to fix the problem is by interacting with you and examining your computer network from there. It is critical for these online technical supports companies to determine how the error evolved and what errors your computers are coming with up. Viewing the importance of adequate knowledge of computer network and various technical layers that it consists of we have come-up with this article that will help people understand what goes on in the backend when you are doing your work on your work station.

Basically, every computer network is made up of 7 different layers that form the circuit of information exchange mechanism. Each layer has a distinct and different function to work on and information can only be exchanged when all these seven layers work smoothly and in conformity. These seven layers are:

  • Application Layer
  • Presentation Layer
  • Session Layer
  • Transport Layer
  • Network Layer
  • Data Link Layer
  • Physical Layer

Now, let us understand what the functions of these layers are and what they actually do as an indispensable component of the whole process. So, let’s start with the first layer:

Application Layer: Application layer is the first layer that the whole circuit starts with. This is the only layer through which a user accesses information from the network or in other words we can say that the application layer is the only means and instrument through which users seek information from the network. For example when we type in the word http://www.superpccare.com on the address bar we are using the application layer to let the server know that we are looking for web pages of superpccare website.  Some of the important examples of application layer implementation are:

  • IP/ TCP Protocol (Transmission Control Protocol/Internet Protocol)
  • HTTP (Hyper-text Transfer Protocol)
  • FTP (File Transfer protocol)
  • POP (Post Office Protocol)
  • IMAP (Internet Message Access Protocol
  • SMTP (Simple Mail Transfer Protocol)
  • UDP (User Datagram Protocol)

So, each time when you browse something on the internet, or sending mail to some, using your outlook client, or using Yahoo messenger you are using any one of these above mentioned protocols that constitutes the application layer of your computer network.

Presentation Layer: Presentation layer is also called as Syntax layer and you can simply call it as Data Translator. Just like a language translator converts one form of language to another similarly the Presentation Layer converts one form of data to another form and here it is digital data. It is the layer that substantiates a particular format of data into an appropriate format so that the local host could understand what kind of data is to be served and same as the case other way round where the data on the receiving end is also substantiated. Putting it simply it is involved with data encryption and makes the data generic so that servers could understand the query or data in question.

Session Layer: The session layer is the 3rd layer and it helps in managing, establishing and terminating communication sessions. Sessions are important because data is shared through small data packets and when a computer system using more than one application there are chances of intermixing of data packets that can create chaos. So, it is the virtue of session layer by means of which it is ensured more than one application runs simultaneously on a single network.

Transport Layer: Transport Layer is the 4th layer in the OSI (Open System Interconnection Model) and is very important one. In fact this is the main layer with which the main computer network starts off. This is the layer that dictates how the data is sent and it is the only layer where port numbers are determined. This is the layer where datagram from higher level of a network is broken down into substantial and manageable datagram. Once the datagram is broken into appropriate format important header information like port number, sequence number and other identifiable elements are attached so that computers can understand where the data is coming from and where it needs to be delivered.

Network Layer: This is the 5th layer where logical addressing of the components is done. Commonly it is also called as IP addressing. Asides, this is the layer that determines the best possible path to a destination.

Data-Link Layer: This is the 6th layer that does the physical addressing of the data packets. This is the layer that constitutes devices like router, modem and other routing devices.

Physical Layer: Physical layer is the most superficial and visible layer in the OSI Model. Anything that you can see and touch is the parts of this layer. So, computer components like keyboards, mouse, wires, cables and Data Interface card all constitute the Physical layer of the OSI Model.

So, with this article you must have realized now that data transmission and communication in a computer network is not a simple task and it involves a lot of technicalities and complexities. It is only for experienced and efficient computer network support professionals to get into the root of the cause and find a permanent and appropriate solution.

If you are looking for some more information related to computer networking, computers, and computer support please visit our blog at http://www.superpccare.com