Case Project 5-3

You must install 125 computers for a new business that wants to run TCP/IP and have access to the Internet. The ISP in town will assign you only four public IP addresses, so you decide to assign the computers addresses in the range 172.16.1.1/16 through 172.16.1.125/16. What else must you do to allow these computers to access the Internet?

Case Project 6-1

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 have.
  • You check some statistics generated by a network-monitoring program and discover that an abnormally high number of CRC errors were detected.
  • 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.
  • A user is trying to connect to another computer, but the logon attempt is continually rejected.
  • 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.
  • You inspect a computer that isn’t able to communicate with other computers.
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