CWNP CWNP Wireless LAN Certifications PW0-205

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CWNP PW0-205 Exam Syllabus Topics:

CWNP Certified wireless analusis professional(cwap) Sample Questions:

Question #1
In the 802.11b standard, the PLCP header Service field has a Modulation Selection bit.
Which of the following are true regarding use of the Modulation Selection bit?

A. The Modulation Selection bit is used to determine whether CCK or PBCC is in use for any speed where either could be used.
B. Based on the setting of the Modulation Selection bit and the value in the Signal field, the modulation to be used can be uniquely determined.
C. The Modulation Selection bit is used to determine which modulation will be used to send the entire PPDU.
D. Based on the Modulation Selection bit in received Data frames, the receiving station can determine which modulation to use when sending acknowledgements.
E. The Modulation Selection bit is used by the access point in CF-End frames to note which modulation will be used for Data frames in the contention period to follow.

Question #2
How does an access point operating in DCF mode notify a client station operating in Power Save mode of multiple multicast frames queued at the access point?

A. The access point sets the More Data subfield in the Frame Control field of each Data frame to 1 until the last multicast frame is delivered.
B. The access point responds to the client station PS-Poll frame with the AID subfield set to a value equal to the number of queued multicast frames.
C. The access point sends the client station a CF-Poll frame with the AID subfield set to the station MAC address.
D. The access point sets the Beacon DTIM to indicate that it has queued multicast traffic for the client station.
E. The access point sets the Duration field of each Beacon to a value equal to the amount of time it will take to send all of the queued multicast frames to the client station.

Question #3
When operating in an 802.11b/g mixed mode environment in which both 802.11b and
802.11g client stations are present and transmitting data on the network, which of the statements below are accurate concerning the 802.11g access point responsibilities in the Basic Service Set?

A. The access point may transmit beacons using a short preamble only if all of the client stations in the BSS have indicated support for short preambles.
B. The access must transmit beacons using a short preamble in a mixed mode environment. Client stations not supporting short preambles will not be able to associate.
C. If beacons are transmitted using short preambles, all associated client stations are required to transmit all data frames using short preambles.
D. The access point will alternate transmitting beacons using long and short preambles so that client stations using either preamble length can associate.

Question #4
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. Beacon frames vary in size, and therefore some take slightly longer to send than others.
C. The access point must compete to gain access to the RF medium in order to transmit a beacon.
D. The DCF Interframe space is nominally 50 , but typically varies by as much as 10 (?0%) causing delays in beacons.

Question #5
Errors at the PLCP layer are common in wireless LANs. Which of the following is NOT a common PLCP error type?

A. PLCP CRC Errors
B. PLCP Format Errors
C. PLCP Length Errors
D. PLCP Overrun Errors

Solutions: