DeVry NETW 360 Week 7 iLab Latest

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DeVry NETW 360 Week 7 iLab Latest

Troubleshooting Common WLAN Problems

Four WLAN troubleshooting scenarios are presented in this lab. Students are expected to practice a typical troubleshooting process: understanding the problem, identifying possible causes, verifying the causes, and recommending solutions.

When troubleshooting, there are various ways of categorizing potential WLAN problems. One could look at them as connectivity and throughput issues: First, a wireless device needs to be connected, and next, it requires an acceptable level of throughput. One could also look at them from the perspectives of wireless clients, access points, and wired network segments. For instance, a wireless client that doesn’t support the appropriate authentication protocol won’t be able to connect to a Wi-Fi network. An access point whose network cable is overly stretched or loose could cause intermittent connection issues. If an authentication server malfunctions, a wireless client could lose connection shortly after its initial association.

WLAN spectrum analyzers and packet sniffers are two types of widely-used troubleshooting tools. They support an array of functions, such as passive monitoring, active testing, and traffic analysis.

Below are some examples of common problems related to WLANs.

  1. 1.RF interferenceis associated to the majority of WLAN problems. In theory, any device that operates on the ISM and UNII bands could potentially interfere with WLAN transmissions. These devices include, but are not limited to, microwave ovens, wireless video cameras, wireless game consoles, cordless phones, and baby monitors. RF interference could either be narrow-band or all-band. An access point can shift to operate on a different channel to avoid narrow-band interference, but it really cannot avoid all-band interference, for example, from older Bluetooth devices.
  2. 2.Co-channel interferenceoccurs when multiple access points in close proximity operate on the same channel.These access points may or may not share the same network or ownership. Such interference could go undetected if the network bandwidth utilization is low or no real-time applications present on the network.
  3. 3.Coverage holesrefer to parts of a WLAN coverage area where the actual throughput is much less than expected or there is no connectivity. Even with a proper initial site survey, a WLAN coverage area could change due to new physical obstacles, replacement access points, and different antennas.
  4. 4.The hidden nodeproblem occurs when two wireless clients on the same network cannot detect each other’s transmission. This renders the MAC layer contention avoidance mechanism useless. Their transmission within the same time window causes damaged frames that need to be retransmitted. In a nut shell, collision causes retransmission, which in turn, reduces throughput.
  5. 5.Weather, such as a dense fog or a blizzard, causes air density changes that could worsen the RF signal attenuation.If the link budget is not done with a healthy margin to factor in local weather conditions, an outdoor WLAN link could become unstable or even fail. Wind could also cause antenna misalignment, which contributes to a decreased throughput or zero connectivity.

Scenario III

Charles is the owner of a flooring store in a small strip mall. His son comes over whenever there is no school to play online video games on the store’s Wi-Fi network. Since a yogurt business moved in next door last month, his son has been complaining that the lagging network speed is causing his winning record to suffer. Charles does book-keeping and occasionally reads news online on the computer; he hasn’t noticed anything significant. Charles changed the password on his Wi-Fi network and moved his wireless router away from the wall he shared with the yogurt store, but none of these helped.

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess? What WLAN tool(s) would you use, and what information would you look for?
  3. 3.Suggest two possible ways of remedying the identified problem.

Scenario IV

John is temporarily assigned to work with the billing department this week. He is given a user name and password to connect to the Wi-Fi network of the billing department. Although his cubicle has some distance from the rest of the billing department staff, IT ensured him that there is Wi-Fi coverage where his desk is. Soon, John noticed that his Wi-Fi connection is noticeably slower. Other billing staff members didn’t have any problems, except Janice whose cubicle is on the other side of the floor. She started to experience a slow Wi-Fi connection the same day John came on board.

IT moved the access point closer to John, but it didn’t help. They connected John’s computer to a network cable for one day and both John and Janice’s problems disappeared.

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess?
  3. 3.Suggest two possible ways of remedying the identified problem.

NETW360 Week 7 iLab

Troubleshooting Common WLAN Problems

Date:

Student’s Name:

Professor’s Name:

Scenario I

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess? What WLAN tool(s) would you use, and what information would you look for?
  3. 3.Suggest two possible ways of remedying the identified problem.

Scenario II

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess? What WLAN tool(s) would you use, and what information would you look for?
  3. 3.Suggest two possible ways of remedying the identified problem.

Scenario III

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess? What WLAN tool(s) would you use, and what information would you look for?
  3. 3.Suggest two possible ways of remedying the identified problem.

Scenario IV

  1. 1.Among the common WLAN problems described at the beginning of this lab, which do you suspect is most likely the problem?
  2. 2.How would you verify and confirm your educated guess?
  3. 3.Suggest two possible ways of remedying the identified problem.

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DeVry NETW 360 Week 7 iLab Latest

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DeVry NETW 360 Week 7 iLab Latest