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CWNP Certified wireless analusis professional(cwap) Sample Questions:

1. In a DCF 802.11g network, when is the Power Management subfield of the Frame Control field set to a value of 1?

A) On any frame transmitted by a client station operating in Power Save mode.
B) Only in management frames sent by a client station immediately prior to entering a low power state (dozing) that are part of a frame exchange sequence.
C) Only in the PS-Poll frame sent from a client station operating in Power Save mode to an access point after the client station awakens from a low power state (dozing).
D) On any Data frame sent by the access point subsequent to a PS-Poll frame.

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

3. 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) 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.
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) 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.
D) 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.

4. What are the primary mechanisms used by an 802.11 BSS during a contention-free period to cause stations that are not the Point Coordinator to defer?

A) CF Parameter Set elements in the Beacons
B) Point Coordination Function Interframe Space (PIFS)
C) Contention-Free Polling List broadcasts
D) Null Function data frames using SIFS
E) The Pseudorandom Backoff Timer in each station
F) All frames transmitted during the CFP have a Duration field value of 32,768

5. An administrator decides to optimize wireless LAN performance by adjusting the fragmentation threshold on each access point to a value much lower than the default of
2346 bytes. She notices that when wireless client stations are doing prolonged data transfers from a wired server, that downstream performance is better than it was before her adjustments. One problem she has not yet solved is why performance in the upstream direction has not been improved due to these adjustments. As a wireless protocol analyst, which of the following explanations would you give to the administrator?

A) Fragmentation is only supported bi-directionally when Antenna Diversity is enabled on both wireless client stations and the access point.
B) World Mode (also known as Multi-Domain Operation) must be enabled for fragmentation to be bi-directional due to regulatory requirements in most countries.
C) The administrator must enable client fragmentation support by configuring the access point to broadcast a special message to the clients in each beacon. This message will automatically notify the wireless client stations to use the same fragmentation threshold value used by the access point.
D) When configuring fragmentation threshold values, it's important to enable RTS/CTS also in order to get effective bi-directional results.
E) Fragmentation thresholds settings are only effective in the downstream direction (toward the wireless client stations) as specified by the IEEE 802.11 standard.
F) Fragmentation thresholds are uniquely set on each wireless client station and access point and affect only transmissions from that node in particular.

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