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CWNP Certified wireless analusis professional(cwap) Sample Questions:

1. In the analyzer trace shown, the TBTT is nominally 100 Kilomicroseconds. Why does the difference between the time Beacons are sent vary?

A) This trace is taken of an 802.11b/g mixed mode network where both 802.11b and
802.11g nodes are active on the network. The access point is changing slot times from short to long as needed.
B) The DCF Interframe space is nominally 50 , but typically varies by as much as 10 (?0%) causing delays in beacons.
C) The access point must compete to gain access to the RF medium in order to transmit a beacon.
D) Beacon frames vary in size, and therefore some take slightly longer to send than others.

2. An 802.11 data frame has multiple address fields. How many address fields are there and how are they used?

A) Five address fields, used for SA, DA, TA, RA, BSSID/HA
B) Three address fields, used for SA/TA, DA/RA, BSSID
C) Two address fields, used for SA, DA
D) Six address fields, used for SA, DA, TA, RA, BSSID, HA
E) Four address fields, used for SA, DA, BSSID/TA, RA

3. 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.

4. 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.

5. Which of the following must be true before an 802.11 station may transmit a frame on the RF medium using DCF mode?

A) The Network Allocation Vector must be equal to zero.
B) All collision arbitration must be completed on the RF medium.
C) A time period of at least PIFS must have passed.
D) A time period of at least DIFS must have passed.
E) The Backoff Timer must be equal to zero.
F) The station must have received a PS-Poll frame from the access point.

Solutions: