Case Project $7-1$

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.

A computer won't connect to the network. After some investigation, you find that the patch cable isn't terminated correctly.

A computer can access resources on the local LAN but not on a different subnet. You find that the computer's default gateway isn't configured correctly.

You can ping a computer you're trying to transfer files to via FTP$,$ but you can't communicate by using FTP$.$

All computers connected to a particular hub have lost network connectivity. You determine that the hub is the problem.

You receive an encrypted text file, but when you open it$,$ the text is unreadable. You determine that decryption didn't take place as it should