CWNP Certified wireless analusis professional(cwap) 認定 PW0-205 試験問題:

1. In an 802.11 wireless LAN frame with either long or short preambles, the PLCP Header consists of multiple fields. Which of the following are valid PLCP Header fields?

A) MSDU
B) Signal
C) SFD
D) Sync
E) FCS

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

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

3. An 802.11b PPDU's preamble consists of two fields and can collectively be considered
"long" or "short" by the 802.11b standard. Which of the following is true regarding the PLCP preamble?

A) 802.11g stations associating to 802.11b access points must use the DSSS preamble length specified by the access point.
B) An 802.11b access point that supports both long and short preambles may allow stations that are using different preamble lengths to communicate through it simultaneously.
C) A long preamble uses a Sync field of 128 bits, and both stations and access points may have configurable preamble lengths.
D) Long and short preamble lengths are both variable depending on the modulation in use on the network, and access points always inform stations of the preamble length in use on the network.
E) A short preamble uses a Sync field of 40 bits, and stations and access points must have matching preamble lengths in order to communicate.
F) When short preambles are being used, the Sync and SFD fields both consist of 16 bits.
Only access points have configurable preamble lengths.

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) 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) 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.
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. When using a wireless protocol analyzer, it is common to see Beacon Management frames (Beacons) being sent several times per second. Which of the following statements is true regarding Beacons?

A) Beacons can be disabled for security purposes.
B) The 802.11 standard specifies that all Beacons must contain a DTIM information element.
C) The reason Beacons are transmitted so often is that they are unicast frames destined to each associated station.
D) The Destination address is always FF:FF:FF:FF:FF:FF.
E) The Receiver address and the BSSID are always the same.
F) The BSSID and Source Address are always the same.

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