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Discovering computer networks: hands on in the Open Networking Lab
Discovering computer networks: hands on in the Open Networking Lab

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2.2 Checking the local network

In this part you will use ideas from Section 2.1 to locate and fix problems in a small local network. In the following video, you will see the network in PT Anywhere and the preliminary stages of locating the problem. In the activity following the video, you are asked to complete the investigation and to fix the problem, or problems.

You might need to remind yourself about how to use PT Anywhere by looking again at the Introduction to PT Anywhere video in Session 1.

Now watch the video below, which is about 5 minutes long.

Checking the local network

Download this video clip.Video player: 11_checking_the_local_network.mp4
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Activity 2 Try it out

15 minutes

Your task in this activity is to make the PT Anywhere network used in the video [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] work properly. You will see that the network has an additional computer, Winston’s computer, which does not appear in the video, but otherwise the network is identical to the one in the video.

A sensible way to proceed is in four stages:

  1. Find the IP addresses of all working devices.

  2. Identify the non-working device(s). (This should emerge from stage 1.)

  3. Give non-working devices suitable settings.

  4. Check that the network works properly. This is not simply a matter of checking that any devices you have fixed are working properly: it’s also necessary to check that the rest of the network has not been messed up.

Answer

My answer can be viewed in the video below, which is about 4 minutes long. In places where I have assigned IP numbers to devices, other IP numbers are possible and would work just as well.

Download this video clip.Video player: 12_answer_to_activity.mp4
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