The OSI model is a useful tool in troubleshooting a network because it enables you to isolate a problem to a particular software module or piece of hardware. In this project, after reading the description of a problem, identify the OSI model layer or layers that are most likely involved.
1) One of your servers has been exhibiting sluggish network performance. you use a network-monitoring program to try to evaluate the problem. You find considerable TCP retries occurring because the server is being overwhelmed by data, and packets are being discarded.
2) You check some statistics generated by a network-monitoring program and discovers that an abnormally high number of CRC errors were detected. (Hint think of the cause of CRC errors).
3) A user is trying to connect to another computer, but the logon attempt is continually rejected.
4) You try to access a Linux server to share files by using NFS. You can communicate with the server, but the shared files don't appear to be available.
OSI Model is a framework or a reference model to determine how applications communicate over a network. It is also used as a guide or reference to the vendors and developers so the digital communication products and software programs they create can interoperate, and to facilitate a clear framework that describes the functions of a networking or telecommunication system.
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fromChapter 2 / Lesson 10
This lesson discusses the physical layer of the OSI model. It also discusses the various components and media used in this layer for the transfer of data. Wired data transmission in the physical layer and its associated components will be broadly covered.