PW0-205 試験問題を無料オンラインアクセス

What 802.11 MAC layer function is illustrated by the following diagram?

• A.Sequential Acknowledgements
• B.PCF mode polling
• C.Sequential Fragmentation
• D.CP Regulated Spacing
• E.Fragment Bursting

Some protocol analyzers have the ability to capture only MAC frame headers (sometimes called packet slicing), and others have the ability to update the capture display without saving the frames permanently (sometimes called stumbling mode). What are advantages of using these two features of a wireless protocol analyzer?

• A.Analyzers can capture traffic on more channels simultaneously due to decreased overhead per channel.
• B.Capturing, analyzing, and discarding headers allows more CPU cycles for real-time decoding and analysis.
• C.Analyzers can use DRAM to store captured frames instead of storing files on a hard drive.
• D.Analyzers with a small amount of frame buffer memory can be used.
• E.Analyzers can be left running for long periods of time without running out of frame buffer space.

Beacon Management frames carry channel information. Channel information can be used by protocol analysts to determine which channel is actually being used when beacons are being received on channels where they are not expected. This situation is often due to cross-channel interference. In an 802.11b Beacon Management frame, what information element carries the current channel information?

• A.Capability Information
• B.Service Set Identifier
• C.Supported Rates
• D.CF Parameter Set
• E.Traffic Indication Map
• F.DS Parameter Set

XYZ Corporation has an 802.11b/g mixed mode deployment, and they are currently experiencing random throughput problems around the entire network. When the network was originally installed, there were both 802.11b and 802.11g stations on the network, but throughput levels were acceptable at any given time. To troubleshoot this issue, you have deployed a distributed wireless protocol analyzer, and it has noted a significantly greater percentage of 1 Mbps Data traffic being sent in random places across the network as compared with the initial baseline testing. When the network was installed, you considered only a minimal amount of 1 Mbps Data traffic acceptable. What could be causing this problem, and how would the analyzer know about the 1 Mbps traffic?

• A.Due to changes in the office environment, some client stations are moving further away from the access points than when the baseline tests were performed. The analyzer views the SIGNAL field in the PLCP header to see the frames transmission rates.
• B.An access point configured for 802.11b/g mixed mode has been reconfigured to send downstream traffic in a round-robin fashion when protection is enabled. The analyzer views the length of the preamble to determine the transmission rate of associated stations.
• C.A wireless network management system has updated all access points to allow only use of the long slot time. The analyzer views the SERVICE field in the PLCP header to see the frames?transmission rates.
• D.A new 802.11g station has a minimum transmission rate set at 1 Mbps. The analyzer views the Start Frame Delimiter (SFD) field in the PLCP header to see the frames?transmission rates.

ABC Company's wireless LAN administrator is getting complaints from one user that his wireless LAN throughput is sluggish compared to other users in his area. The administrator takes his diagnostics laptop, which has a wireless protocol analyzer installed, to the area where the complaining user works. The administrator uses the PING utility to test connectivity from the complaining user's wireless client station to another wireless client station across the closest access point, while capturing the wireless frames. The administrator sees what is displayed in this screenshot. From this screenshot, which of the following statements can you conclude to be true that are related to the complaining user's throughput problem?

• A.The access point is not signaling for protection (Protection = no) in the Beacons, but it should be.
• B.The complaining user's wireless client station should be using RTS/CTS as a protection mechanism, but it is not.
• C.The complaining user's wireless LAN client utilities are configured for a small fragmentation threshold.
• D.The access point is 802.11g, and the complaining user's wireless client station is
  802.11b
• E.The complaining user's station is retransmitting fragments many times likely due to nearby RF interference