DeVry NETW 360 Week 6 iLab Latest

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DeVry NETW 360 Week 6 iLab Latest

Evaluating Security-Related WLAN Problems

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Scenario I: Signal Spillage

  1. 1.Compare the physical boundary of the building to the signal coverage area.Name a couple of locations where the incidents of signal spillage occur (e.g., the northwest corner)?
  2. 2.Assume the external antennas being used are all omni-directional with an antenna gain of 2.14 dBi.Given all other conditions remain the same, how would relocating some of the access points to a different part of the floor help reduce the amount of signal spilling outside of the building?
  3. 3.Given all other conditions remain the same, how would replacing some of these antennas help reduce the amount of signal spilling outside of the building? What type of antennas would you recommend?
  4. 4.Given all other conditions remain the same, how would adjusting the power level of some access points help reduce the amount of signal spilling outside the building? What undesirable outcome, from the signal coverage perspective, will likely be caused by such isolated adjustments?
  5. 5.Research a couple of other methods that could help reduce signal spilling outside of a building.

Scenario II: WLAN Security Standards

  1. 1.Refer to the diagram above.Is the network, as well as the information transmitted on the network, protected from eavesdropping?
  2. 2.Among the typical security standards, such as WEP, WPA personal, WPA enterprise, WPA2 personal, and WPA2 enterprise, which one is best suited for the intended use of the “Monitor” network as described in this scenario?
  3. 3.Justify your recommendation in the previous question.

Scenario III: Rogue Access Points

  1. 1.Refer to the screenshot.What’s the name of the identified rogue access point?
  2. 2.Given the inSSIDer software installed on a laptop, how would one go about physically locating this rogue access point?

MHz).

  1. 5.Let’s assume some network parameters of the “linksys” access point have been changed.After several seconds, the information shown in the inSSIDer window is also changed as captured below.
  2. 6.Refer to the truncated list of detected access points from the middle section of the inSSIDer window shown below and answer the following questions.
  3. a) Which CHANNEL(s)is (are) used by the “linksys” access point now?
  4. b) What’s the MAX RATEof this access point or network?
  5. c) What SECURITYstandard is used by this access point or network?
  6. d) What’s its NETWORK TYPE?
  7. 7.Refer to the detailed information about the “linksys” access point shown below and answer the following questions.
  8. a) How many Co-Channelsare listed here?
  9. b) What’s the Overlappingvalue?
  10. c) Explain what the Overlappingvalue means.
  11. 8.Refer to the graphical representation of the access points shown in the diagram below and answer the following questions:
  12. a) What’s the transmission channel width (in MHz) of the “linksys” access point now?
  13. b) If the “linksys” access point is meant to work in harmony with other access points in the same environment, what went wrong with the configuration changes?

Task 2: Monitoring Signal Strength

The amplitude of a wireless signal measured by WLAN and site survey tools is referred to as received signal strength indication (RSSI). Higher RSSI values are often associated with higher data rates and fewer retransmissions. RSSI is typically used by vendors for purposes such as roaming handoff and data rate switching. It could also be used, during a site survey, to mark the coverage boundary of an access point. For instance, Cisco recommends the minimum RSSI of -67 dBm for voice applications.

Notice that RSSI is an indicator of relative signal strength; it could be mapped to the actual signal strength based on each vendor’s specifications. Different vendors’ tools most likely provide different RSSI values in the same environment. Therefore, RSSI values from different vendors should not be directly compared to each other.

Another parameter typically used in site surveys to define the coverage boundary of an access point is the signal-to-noise (SNR) ratio. It is an indicator of how much stronger a measured signal is in relation to the noise level. Higher SNR values typically indicate higher data rates, fewer retransmissions, and better throughput. For instance, Cisco recommends the minimum SNR of 25 dB for voice applications.

The following inSSIDer screenshots demonstrate how the Signal and Link Score values change when the wireless client with inSSIDer installed moves away from the “linksys” access point. As explained in MetaGeek’s quick start guide for the inSSIDer Home software, Signal is “the amplitude level of the wireless network as seen by your computer’s wireless adapter, also known as RSSI.” Link Score is “a grade for each network calculated by its signal strength, channel power, and number of networks competing for airtime.”

  1. 1.Refer to the detailed information about the “linksys” access point shown below and answer the following questions.
  2. a) What’s the Signalstrength of this access point when the screenshot was taken?
  3. b) What’s the Link Score?
  4. 2.The laptop with the insider software installed is moved away from the “linksys” access point for a certain distance in the same room, but hidden underneath a computer table.

Refer to the detailed information about the “linksys” access point shown below and answer the following questions.

  1. a) What’s the Signalstrength of this access point when the screenshot was taken?
  2. b) What’s the Link Score?
  3. 3.At the same location, position the laptop with inSSIDer installed on top of the computer table.

Refer to the detailed information about the “linksys” access point shown below and answer the following questions.

  1. a) What’s the Signalstrength of this access point when the screenshot was taken?
  2. b) What’s the Link Score?
  3. c) What could be the reason that the signal strength is higher, although the distance between the access point and the wireless client (with inSSDIer installed) has not changed?
  4. 4.The laptop with the insider software installed is moved further away from the “linksys” access point into a different room across the hall.

Refer to the detailed information about the “linksys” access point shown below and answer the following questions.

  1. a) What’s the Signalstrength of this access point when the screenshot was taken?
  2. b) What’s the Link Score?

 

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DeVry NETW 360 Week 6 iLab Latest

Best DeVry NETW 360 Week 6 iLab Latest

DeVry NETW 360 Week 6 iLab Latest