After the Last Tipps about The first steps of science Troubleshooting follow up with you today to provide the second step in this professional world.
I will talk about the ways and methods used in reducing the proportion of the possibilities that cause, which helps us identify the problem faster (Troubleshoot Approaches)
Usually when faced with a problem solved in the networks start to take some steps, which in turn helps us to decrease the proportion of the possibilities that cause this problem and these steps vary according to the experience of the person and the quality of the problem
today we will talk about these methods and approaches which are in general six ways:
The Top-Down Method
The way the first one of the ways in which depends on the OSI Layer, which begins in the layer of the Application Layer and heading down.
this method called the top down, is this technique one of the methods known in the event of problems is based on the principle to examine the reasons by examining higher-layer down to the last layer To nearest to you the idea we take a concrete example: a connection with your people and tell you that he has a problem with the Internet? When we begin to solve the problem using this method we start examining From application layer, and we try to make sure that the browser is work and that the problem is not form him and then turn to the rest of the classes and try to make sure that each layer is working correctly ,in our example, will go to the Transport Layer to make sure that port 80 and the TCP Protocol are working correctly and so on until we reach the last layer Physical Layer in which we are sure of cables and etc …. Which will lead us in the other began to outline the problem further.
The Bottom-Up Method
The same idea of the first method is also based on the OSI Layer to solving problems, but here we start from the layer of the Physical Layer down and going to the top. is also effective method but not suitable for large companies because the work will then take a long time already, for example if in the event of a problem between a client And Server We will have to start examining all cables connected between the two parties and so on up to higher layers.
The Divide and Conquer Method
Method is the most famous and efficient to solving problems which like its predecessors, also depends on the layers of the OSI which starts from the middle and then determined where you turn to the Network Layer, simple example of this method we assume that a people, he can not access to the The web Server where he located in the company? If we follow this method the solution is to do Ping to the server and wait for results if the results were positive, than we go to the top Layers if the results were negative Than we go to the down Layers.
this method is one the most popular methods because it simply saves time and effort.
Following the Traffic Path
Follow the path, a method is useful and fairly simple which would help to identify the place or the Area of the problem and that by tracking the path of Packet to reach the target or destination.
simple example, suppose that there is a problem between the server and user or Client, between them including a switch and Router , begin steps to solve the problem check the cable between the user and Swish Then make sure the communication between them and then examine the cable between the router and server to make sure there is a connection between them and so that we can draw first steps to define the problem.
This method is the simplest and easiest methods used to identify the problems, which usually the beginners, like a games, which we see on some channels fraud on television on the identification of points of difference between the two photos, and certainly one who can locate the difference winning a hundred thousand dollars!.
the important method is based on the same idea by comparing the settings on another place.
as a simple example suppose that there is a router does not function or there is a technical problem, the solution that we do a comparison between version body of your earlier for the same router with the settings of existing or that we are comparing the settings on the router have The same process carried out.
or we have two machines (pcs) one computer can surf on the Internet and the second is not.
the solution we are comparing the settings and hardware with the work PC with the settings in anther PC which does not function.
the first to discover the points of disagreement between them and this includes IP, firewall and browser settings and etc ….
The sixth and last method is also a special for beginners like me but effective somewhat. dependent on the switch elements that cause this problem.
simple example, suppose that we have a problem between the device(pc) and switch, we first change the Old cable with another New cable Old and be sure that the new cable works (better to use Experimenter cable not a completely new) even if the results were also negative, we replace the Swish and then replace the computer and etc ….
To get to identify the features of this problem.
I hope you understand my ideas raised in this topic is rudimentary but we must know that a return to principles is very important, especially the problems that occur usually caused by a very simple and sometimes illogical .