Cisco CCNA CCNP CCSP exams

　
　
Exam : CENP PW0-205
Title : certified wireless analusis professional(cwap)

1. Which of the following is true regarding frame acknowledgement in an 802.11 wireless LAN?
A. ACK frames following Data fragments set the NAV of competing stations for a duration equal to two SIFS plus the next Data fragment and its ACK.
B. A client station reassociation request frames are only acknowledged with a reassociation response from the access point when roaming in a wireless LAN secured with 802.1X/EAP.
C. Probe request acknowledgement (sending of a probe response) is configurable in the access point and is always linked to SSID broadcast configuration in Beacons.
D. Beacon frames are acknowledged by all client stations configured for PCF mode.
E. Frame fragments are acknowledged individually (with an ACK frame)
F. In PCF mode, WEP-Data frames are only acknowledged by client stations, never by access points.
Answer: AE

2. Which of the following descriptions accurately describes IEEE 802.11 compliant Power Save mode operation in a DCF Basic Service Set?
A. Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.
B. When the access point’s buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.
C. Upon receiving traffic for a dozing station, the access point wakes the client station using a PS-Poll frame so that the client station can receive the data.
D. After waking from a low power state, client stations listen for the next beacon to determine if sending a PS-Poll frame to the access point is necessary.
E. After waking at a schedule TBTT, client stations automatically send Null Function frames to the access point with the Power Management bit cleared.
Answer: D

3. Which is true of the Association Identifier (AID) used in 802.11 wireless LANs?
A. The AID has a maximum value of 2048, and is used to uniquely identify a wireless client station associated with an access point.
B. The AID has a maximum value of 2007, and resides in the duration/ID field of a PS-Poll frame only.
C. When bit 16 of the field is zero, the value in bits 15-0 represent the remaining duration of a frame exchange.
D. The least significant 8 bits of this field are used by the wireless client station to identify which bit in a TIM indicates that the access point has frames buffered for the wireless client station.
E. The AID is used by the access point in DCF mode to reduce duplicate transmissions when sending multicasts.
Answer: B

4. An 802.11b client station, sends a single 600 byte MSDU to another 802.11b client station while operating as part of an unsecured infrastructure BSS. Due to thresholds set on all client stations and the access point, all MPDUs over 300 bytes in length invoke the RTS/CTS protocol. How many individual CTS frames are transmitted on the wireless medium as part of the entire process of moving the 600 byte MSDU between the two client stations?
A. 1
B. 2
C. 3
D. 4
Answer: B

5. The Timestamp field, found in 8011 Beacon Management frames, is 8 bytes in length and serves which of the following purposes?
A. Keeps all client stations in a BSS synchronized to within approximately 4 microseconds of the access point.
B. Allows client stations in the IBSS to pick the best of multiple beacons.
C. Used to notify client stations using power management features of how long their queued frames have been held by the access point.
D. Informs associating client stations how often to expect Beacon Management frames to be sent by the access point.
E. Allows all client stations in a BSS to calculate how long it took for the Beacon Management frame to traverse the wireless medium.
Answer: AB

6. Choose the true statements regarding wireless network discovery processes for an 802.11b network.
A. Client stations may continually send Probe Request frames on all 802.11b channels in the 2.4 GHz ISM band in a consecutive manner, regardless of their association state.
B. Access points send Beacon Management frames on all 802.11b channels in the 2.4 GHz ISM band in a consecutive manner including the channel for which the access point is configured.
C. Client stations send Probe Request frames on all 802.11b channels in the 2.4 GHz ISM band in a consecutive manner until they associate with an access point. After associating to an access point, they are no longer allowed to transmit Probe Request frames.
D. Access points send Beacon Management frames only on the 802.11b channel in the 2.4 GHz ISM band for which the access point is configured.
E. Client stations send Probe Request frames on all 802.11b channels in the 2.4 GHz ISM band in a consecutive manner until they receive at least 3 Probe Response frames.
Answer: AD

7. When an access point sends an RTS frame, the duration field will contain an amount of time, measured in microseconds, equal to which of the following?
A. 2 ACK, 1 RTS, 1 DATA, 4 SIFS
B. 1 ACK, 1 CTS, 1 DATA, 3 SIFS
C. 1 DATA, 1 RTS, 2 SIFS, 1 DIFS, 1 ACK
D. 1 RTS, 1 CTS, 1 DATA, 2 ACK, 4 SIFS
Answer: B

8. A wireless network administrator has examined the frame retry counts on several client stations in a WLAN that is not using encryption, and has determined that they are extraordinarily high. For this reason, he has decided to configure station fragmentation thresholds to 400 bytes. With this configuration change, when a data frame with a 1500 byte MSDU is transmitted by one of the wireless client stations to a wired station through an access point, what will be the order and size (in bytes) of the fragments as they’re transmitted?
A. Frame1 = 400, Frame2 = 400, Frame3 = 400, Frame4 = 300
B. Frame1 = 300, Frame2 = 300, Frame3 = 300, Frame4 = 300, Frame5 = 300
C. Frame1 = 300, Frame2 = 400, Frame3 = 400, Frame4 = 400
D. Frame1 = 400, Frame2 = 400, Frame3 = 400, Frame4 = 400, Frame5 = 40
E. The fragmentation threshold setting on client stations only affects received frames, not transmitted frames
F. The fragmentation threshold setting on client stations is not a manual adjustment, and can only be auto-configured by access points
Answer: D

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