DeVry NETW 360 Week 3 iLab Latest

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DeVry NETW 360 Week 3 iLab Latest

NETW360 Week 3 iLab: Observing RF Activities

Wireless signals are invisible to the human eye. To observe these signals, tools such as a spectrum analyzer are required. Displaying wireless signal strength with respect to its frequency, a spectrum analyzer typically captures activities in a pre-defined range of frequencies. It is often used for layer 1 site survey in WLAN monitoring and planning.

In this lab, students learn how to use a spectrum analyzer to identify potential RF interferences on a wireless LAN.Notice that the analyzer operates on the 2.4 GHz and 5 GHz bands; students will observe RF activities across the 11 WLAN channels of the 2.4 GHz band.

Task 1: Tutorial

Review Tutorial: Using Spectrum Analyzer Wi-Spy located in Appendix A.

  1. 1.Name the three default views of Chanalyzer 3.4 that display RF activities from different perspectives.

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  1. 2.Explain what hardware and software are required in this iLab to capture and visualizeRF activities.

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Task 2: Observing RF Activities

Students are not required to capture RF activities on the spectrum in this iLab. Four capture files are provided for students to observe and identify RF activities instead.

  1. 1.Go to.devry.edu/”>http://lab.devry.edu.Enter “Chanalyzer” in the search field on the top right corner to locate and select the Chanalyzer program.
  2. 2.Click on the Chanalyzer icon in the window, and launch the program in the Citrix environment.Click on the Cancel button to close the Chanalyzer 3.4 registration window.
  3. 3.In the Chanalyzer window, click File and Open Recording… to navigate to G: drive.In the NETW360 folder, locate and open the first capture file: Capture1.wsr. Let the recording run for at least five minutes, and answer the following questions in your lab report.
  4. 4.There are three non-overlapping channels on the 2.4 GHz band: 1, 6, and 11.Move the cursor over each of the 11 channels shown on the horizontal axis. What channel(s) currently in use overlap with other channels?

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  1. 5.To rectify the problem in Step 4, to which channel would you move that overlapping device or access point to?

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  1. 6.In the Chanalyzer window, open the second capture file: Capture2.wsr.Let the recording run for at least 5 minutes, and answer the following questions in your lab report.
  2. 7.Move the cursor over each of the 11 channels shown on the horizontal axis.What channels are being used?

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  1. 8.Cross-reference the information in the Spectral View, Topographic View, and Planar View windows.Which channel is being used the most?

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  1. 9.In the Chanalyzer window, open the second capture file: Capture3.wsr.Let the recording run for at least 5 minutes, and answer the following questions in your lab report.
  2. 10.Click on the vertical SIGNATURES tab on the right of the Chanalyzer window.Scroll down the list, and compare the signatures to the pattern shown in the Topographic View window. What device most likely generated the RF activities across channels 8 and 9 in the capture file?

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  1. 11.Click on the vertical INSPECTOR tab on the right of the Chanalyzer window.Move the cursor over the center frequency of the RF pattern in the Topographic View window. Double-click the mouse in any of the three views to generate a vertical referencing line. Double-click again to remove it. What frequency (not channel!) is being used by this device?

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  1. 12.In the Chanalyzer window, open the fourth capture file: Capture4.wsr.Let the recording run for a few seconds, and answer the following questions in your lab report.
  2. 13.Click on the vertical SIGNATURES tab on the right of the Chanalyzer window.Scroll down the list, and compare the signatures to the pattern shown in the Topographic View window. What device most likely generated the RF activities around channel 6 in the capture file?

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  1. 14.Wait until the capture file stops running.Click on the vertical INSPECTOR tab on the right of the Chanalyzer window. Switch on both the Max and Average formats in the Planar View window. Move the cursor over to the center frequency (i.e., channel 6) of the RF pattern in the Topographic View window. What are the maximum signal strength and average signal strength in dBm recorded in this capture, respectively?

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  1. 15.In the Chanalyzer window, click File and Exit to close the program.

Appendix A

Tutorial: Using the Spectrum Analyzer Wi-Spy

The hardware used to capture and record the activities on the 2.4 GHz band in this lab is a USB-based spectrum analyzer: Wi-Spy from Metageek (.metageek.net/”>www.metageek.net).

The device itself looks like this:

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As demonstrated in the following diagram, Chanalyzer is the program that displays what is captured by Wi-Spy and helps visualize the RF activities.

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Observing data (required in this iLab)

The red line at the bottom of the diagram indicates the time line of a data capture. In this particular case, the capture has lasted for 29 seconds.

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In the Spectral View window on the top of the diagram, a color bar is used to represents signal strength. The colors towards the left side represent weaker signals, with the weakest being -110 dBm. The colors towards the right side represent stronger signals, with the strongest at -54.5 dBm. Vertical stripes in the Spectral View window indicate steady signals around a particular WLAN channel. For instance, a weak but constant signal (i.e., a blue-colored stripe) near channel 8 is shown in the diagram below.

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The Topographic View window is in the middle of the diagram; it shows the RF signal patterns with a color coding system similar to that of the Spectral View. The cooler the color, the less often that particular frequency and signal strength pair occurred. The actual signal strength in dBm is shown on the vertical axis.

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The Planar View window is on the bottom of the diagram. It illustrates the relationship between the signal strength and frequency in one, two, or all of the three formats: the current signal strength in yellow, the average signal strength in green, and the maximum signal strength in blue. The actual signal strength in dBm is shown on the vertical axis.

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In the Planar View window, each of these three formats can be turned on or off by clicking its name in the upper right corner. When looking for RF interferences, it is recommended to turn off the maximum and average signal strength formats and only display the current signal strength in yellow.

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Common signal signatures can be accessed by clicking on the vertical SIGNATURES tab on the right side of the diagram. As show in the second diagram below, a selected signature will follow the mouse over to the Topographic View window for one to match/ identify a RF activity pattern.

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Capturing data (not required in this iLab)

Capturing data requires a wireless NIC be present in the same system that the USB spectrum analyzer Wi-Spy is connected to. After the hardware is ready, select the vertical Wi-Fi tab in the Chanalyzer window and then click Start Scanning as shown in the diagram below. Once the network list in the SIDE BAR pane is complete, select the ones to be shown in the spectrum display windows.

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NETW360 Week 3 iLab: Observing RF Activities

Date:

Student’s Name:

Professor’s Name:

Task 1: Tutorial

Review Tutorial: Using Spectrum Analyzer Wi-Spy, located in Appendix A.

  1. 1.Name the three default views of Chanalyzer 3.4 that display RF activities from different perspectives.
  2. 2.Explain what hardware and software are required in this iLab to capture and visualizeRF activities.

 

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DeVry NETW 360 Week 3 iLab Latest

Best DeVry NETW 360 Week 3 iLab Latest

DeVry NETW 360 Week 3 iLab Latest