ABC Company is having throughput problems on their 802.11b wireless LAN. A wireless administrator has noticed in the wireless client station utilities that the MAC CRC Error count is higher on stations with problems than those client stations without problems. A high MAC CRC Error count is NOT attributable to which of the following?

• A. High multipath conditions due to bounced signals
• B. Overlapping access point coverage on a single channel
• C. Co-located PCF and DCF mode access points that are using non-overlapping 2.4 GHz channels
• D. 2.4 GHz ISM band interference from sources such as wireless phones
• E. Collisions due to dense population of client station adapters

XYZ Corporation is renting space in a multi-tenant office building and has recently installed a new 802.11b wireless LAN in their office. The network administrator has very little experience with wireless LANs, and has recently purchased a wireless LAN protocol analyzer for diagnostic use. He has attended a wireless administration class and understands basic wireless LAN operation. During the course of troubleshooting a performance problem, the administrator cannot understand why he is seeing ATIM frames, CF-End frames, and PS-Poll frames on channel 2 all at the same time. You are hired by the administrator as a consultant to explain why this is happening. Which of the following explanations is NOT plausible?

• A. Seeing ATIM frames, CF-End frames, and PS-Poll frames in the same capture is normal. Seeing these frames together means that Power Save Poll mode is in use on a PCF mode network.
• B. XYZ Corp's wireless LAN is using channel 2, and their neighbors in the building are running PCF mode networks and Ad Hoc networks on channel 2 as well. Each of the wireless networks have client stations operating in low-power mode.
• C. XYZ Corp's wireless LAN is using channels 1, 2, and 3. This design is causing adjacent channel interference, which is corrupting 802.11b frames. The analyzer is seeing this frame corruption and reporting the frames as it sees them.
• D. XYZ Corp's wireless LAN is using channels 1, 6, and 11. The frames the administrator is seeing while capturing on channel 2 are corrupted frame fragments that the analyzer is attempting to interpret.

Before accurate statistical troubleshooting with a wireless protocol analyzer can be performed on a wireless LAN, which of the following must be completed?

• A. Baseline traffic analysis
• B. Traffic injection analysis
• C. Directional traffic filtering
• D. Operational traffic policy
• E. Quality of Service (QoS) design

While at a government-operated facility, you are attempting to troubleshoot a wireless LAN performance problem using a wireless protocol analyzer. When you start capturing frames, you see a proprietary layer 2 protocol running over the 802.11g network as shown in this screenshot. The facility's wireless LAN administrator confirms that this protocol is proprietary and used for both data encryption and compression. How will this affect the steps you take to troubleshoot performance problems on this wireless LAN?

• A. Troubleshooting will be hindered, but not eliminated because only part of the information needed for performance measurements by the analyzer is encrypted. Each Data frame's MAC header will be encrypted, but the PLCP header can still be decoded successfully.
• B. In order to troubleshoot performance problems on a network using a proprietary encryption protocol, you must use a wireless protocol analyzer that has integrated support for the protocol in use.
• C. The proprietary encryption protocol will have no effect on your troubleshooting steps because the wireless LAN analyzer can still decode the PLCP and MAC headers of Data frames. This situation is essentially no different than troubleshooting a wireless LAN that uses WEP.
• D. As long as you load the proprietary client software onto your analyzer computer, you will be able to see all of the Data frames fully decoded. Doing this will allow you to troubleshoot the wireless LAN as though no encryption were in use.