Lesson 12 Lab Key Lab Exercises

Transcription

1 Lab 1 Doing a Ping Test Lesson 12 Lab Key Lab Exercises The purpose of this lab is to familiarize the student with running a ping test. This lab will also help the student correctly interpret the results of a ping test that they have run. Materials The Lab Run Ipconfig A computer running Windows Paper Pen or pencil 1. Click the Start button. 2. Type cmd in the Run box or the Search box depending on which version of Windows you are using. 3. When the CLI windows comes up type ipconfig /all then hit the <Enter> key on your keyboard. (Note: There should be a space between ipconfig and the /.) The result should be similar to Figure

2 The screenshot shown in Figure is taken from Windows 7. If you are running Windows XP your screen will look more like the one shown in Figure 12-2 from earlier in this lesson. 4. Write down the IP address of the local computer. 5. Write down the subnet mask of the local computer. 6. Write down the IP address of the default gateway of the local computer. 7. Write down the IP address of the local DNS server.

3 Conduct the Ping Test 1. In the Command box type ping /? and hit the <Enter> key. What are some of the options available for the ping command? Write down six of them and what they do. This answer will vary from student to student as there are more than 6 options available with the ping command. 2. Type the command ping and hit the <Enter> key. You should get a screen that looks like Figure What is significant about the IP address ? is the loopback IP, or the home IP. When using this IP address, you are telling the computer to ping its own NIC. What does being able to ping the IP address tell us about the local computer? Being able to ping the loopback IP tells us that the NIC is working properly. What would it mean if we could not ping the IP address It would mean that there is something physically wrong with the NIC. 3. Ping the IP address of your local computer, which you recorded in step 4 of Lab 1. Were you able to ping your local IP address successfully? What does being able to ping your local IP address tell us about the local computer? It tells us that the local NIC is able to identify its own IP and that the drivers are working fine. What would it mean if we could not ping the IP address of the local computer? It would mean that there is something wrong in the software of the NIC, and it may be necessary to re-install the drivers.

4 4. Ping the IP address of your local computer s gateway that you recorded in step 6 of Lab 1. Were you able to ping the IP address of your local gateway successfully? What does being able to ping the IP address of the local gateway tell us about the local network? This tells us that the local network is up and running fine. What would it mean if we could not ping the IP address of the local gateway? That the NIC is not connected or that there is a bad connection somewhere between the local computer and the gateway the local computer is using. Alternatively it could indicate that the local router is down or not configured correctly. 5. Ping the IP address of your local DNS server that you recorded in step 7 of Lab 1. Were you able to ping the IP address of your local DSN server successfully? What does being able to ping the IP address of the local DNS server tell us about the local network? It tells us that the network is good up to the location of the DNS server. What would it mean if we could not ping the IP address of the local DNS server? It could indicate that the network is down somewhere between the local computer and the DNS server or that there is something wrong with the DNS server. It could also indicate that the IP address of the DNS server is wrong.

5 Lab 2 Using Tracert The purpose of this lab is to teach the student how to use the tracert Windows CLI command. This lab also teaches the students how to interpret the information they get back from the tracert command and how they can use that information in troubleshooting a network. Materials A computer running Windows Paper Pen or pencil The Lab Use the Tracert Command 1. Open a command-line window like you did in Lab Type the command tracert /? and hit the <Enter> key on the keyboard. Write down all the options available with tracert and what they do. There are 8 tracert options. The student can copy down these 8 options and the description that is included with them off the screen. 3. Do a tracert on the URL yahoo.com. The command you should use is tracert yahoo.com and then press the <Enter> key. You should get a screen that looks similar to the one shown in Figure

6 Take Note Although your results will look similar to Figure 12-34, they will not be the same; so you cannot use Figure to answer the questions. 4. Write down the IP address of yahoo.com that was used for the trace route. (Note: There are a number of IPs that Yahoo owns, so answers here will vary.) 5. Were you able to get to yahoo.com? 6. If you were not able to get to yahoo.com, why do you think that was? The student answers will vary on this question. It is important to look at the reasoning behind the answer. 7. Could a firewall have stopped you? If you think a firewall stopped you, what do you think the IP address of that firewall is based on where the trace route stopped? The IP of the firewall will likely be the last successful ping the tracert was able to make. If you do not think a firewall stopped you, what does the last IP address appearing in the trace route list tell you? This question is primarily about the student s reasoning and trying to get them to think critically about what they see on the screen.

7 8. If you were able to do a trace route all the way to yahoo.com, how many hops did it take? This answer will vary based on schools and other factors. 9. List the name and IP address of a few of the servers you passed through on your way to yahoo.com. This answer will vary depending on a number of factors. Also, you should keep in mind that not all servers you pass through will have names, but some of them will. 10. As a troubleshooting tool, what types of things do you think you can learn by using the tracert command? The answers to this question will vary from student to student. The key point of the question is to get them to think critically about the advantages and uses they can get from the tracert command line tool.