DeVry NETW 360 Week 5 iLab Latest

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DeVry NETW 360 Week 5 iLab Latest

 

NETW360 Week 5 iLab: Discovering Access Points and Monitoring Signal Strength

Taking detailed measurements required for the successful installation of a WLAN, site survey programs come in different forms. Some programs use their own hardware, and some work with the host environment, such as a laptop.Some of them are designed to conduct manual site surveys and some are used for predictive site surveys.

inSSIDer from .com/”>metageek.com could be used in the process of a site survey. Once installed, inSSIDer works with a compatible wireless NIC to reveal important information of the WLAN environment it’s in. Aside from detecting various access points or WLAN networks, it can also verify network parameters, find RF shadows, detect rouge access points, and help fine-tune antenna positions.

In this lab, a series of inSSIDer screenshots are evaluated by students. It serves as an example to demonstrate how WLAN professionals, during a site survey process, discover access points and investigate or verify their network parameters. These parameters include network type, security standard, channel, maximum transmission rate, co-channels, and overlapping channels.

Task 1: Discovering Access Points

Once launched, the inSSIDer program displays a list of access points it picked up as demonstrated in the diagram below. Depending on the software version, the following sections are typically included in the inSSIDer window.

  • The FILTERSsection, on the top of the window, which allows one to display or hide network parameters
  • The list of detected access points in the middle section of the window
  • The graphical representation section (2.4 GHz Bandand 5 GHz Band), on the bottom of the window, where access points and their channels are shown
  • The detailed information section, on the right side of the window, displays the information about an individual access point that is highlighted on the list of detected access points
  1. 1.Refer to the truncated list of detected access points from the middle section of the inSSIDer window shown below and answer the following questions.
  2. a) Which CHANNELis used by the “linksys” access point?
  3. b) What’s the MAX RATEof this access point or network?
  4. c) What SECURITYstandard is used by this access point or network?
  5. d) What’s its NETWORK TYPE?
  6. 2.Refer to the detailed information about the “linksys” access point shown below and answer the following questions.
  7. a) How many Co-Channels are listed here?
  8. b) What does this value mean?
  9. 3.When clicking on the CHANNELcolumn in the inSSIDer window, the access points discovered by the software are sorted based on their channels. The 16 access points operating on channel 6 (including the “linksys” access point itself) are listed in the diagram below.
  10. 4.The graphical representation of these 16 access points is shown in the diagram below.Notice that theirtransmissionchannel width is 20 MHz (5 MHz per channel * 4 channels = 20 MHz).
  11. 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.
  12. 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.
  13. a) Which CHANNEL(s)is (are) used by the “linksys” access point now?
  14. b) What’s the MAX RATEof this access point or network?
  15. c) What SECURITYstandard is used by this access point or network?
  16. d) What’s its NETWORK TYPE?
  17. 7.Refer to the detailed information about the “linksys” access point shown below and answer the following questions.
  18. a) How many Co-Channelsare listed here?
  19. b) What’s the Overlappingvalue?
  20. c) Explain what the Overlappingvalue means.
  21. 8.Refer to the graphical representation of the access points shown in the diagram below and answer the following questions:
  22. a) What’s the transmission channel width (in MHz) of the “linksys” access point now?
  23. 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 5 iLab Latest

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DeVry NETW 360 Week 5 iLab Latest