CWAP CWAP Certifications PW0-270 Questions & Answers

• Question 41:

  What two IEEE 802.11 entities may be used to separate successful transmissions within an EDCA TXOP? (Choose 2)

  A. SIFS

  B. AIFS

  C. ACK

  D. CAP

  E. PIFS

  F. EIFS

  G. RIFS

  Correct Answer: AG

• Question 42:

  How long, in microseconds, is the required Slot Time that is announced by an AP in an HT BSS when HR/DSSS, ERP-OFDM, and HT-OFDM client stations are associated to the AP?

  A. 2 祍

  B. 4 祍

  C. 9 祍

  D. 10 祍

  E. 20 祍

  Correct Answer: E

• Question 43:

  Which statements accurately describe IEEE 802.11 EDCA collision handling in a WMM-compliant infrastructure WLAN? (Choose 2)

  A. When frames collide within a QoS STA, data frames from lower priority ACs behave (as it relates to contention) as if there were an external collision on the wireless medium.

  B. Collisions between contending EDCAFs within a QoS STA are resolved within the QoS STA

  C. When a frame transmission on the wireless medium fails, the transmitter may not transmit another frame from any AC or to any destination until the frame experiencing a failure is successfully transmitted or the max retry count for that frame is reached.

  D. The WMM specification requires use of RTS/CTS as part of the EDCAF within each QoS STA to avoid internal collisions between ACs.

  E. After frames collide within a QoS STA and the lower priority AC subsequently gains a TXOP, the retry bit in the MAC header must be set to 1 to indicate a retry.

  Correct Answer: AB

• Question 44:

  The Retry subfield is found in which IEEE 802.11 frame field?

  A. Sequence Control field

  B. Protocol Order field

  C. Data Control field

  D. Frame Control field

  E. MAC Service Data Unit field

  F. QoS Control field

  Correct Answer: D

• Question 45:

  Which information elements (IE) are contained in an IEEE 802.11 Probe Request frame? (Choose 2)

  A. RSN IE

  B. SSID

  C. Status code

  D. Association ID

  E. Supported rates

  Correct Answer: BE

• Question 46:

  According to the IEEE 802.11 standard, what is one structural difference between a MAC Protocol Data Unit (MPDU) and a MAC Management Protocol Data Unit (MMPDU)?

  A. The MPDU frame's FCS field is 4 bytes, while the MMPDU frame's FCS field is 8 bytes.

  B. The MMPDU frame body is limited to 300 bytes, whereas the MPDU frame body can carry up to 2304 bytes.

  C. The MPDU header always places the BSSID in the first address field, but in the MMPDU the BSSID can be found in any of the address fields.

  D. An MMPDU header may only contain three address fields, but an MPDU may have four address fields.

  E. Both the MPDU and MMPDU have a QoS Control (QC) field, but all bits of the MMPDU's QC field are always 0.

  Correct Answer: D

• Question 47:

  Which parameters accurately describe the Beacon Interval field in the Beacon frame? (Choose 2)

  A. Value can range from 0 to 2007

  B. 4-octet length

  C. Indicates the exact time interval between Beacon transmissions

  D. Indicates the desired time interval between TBTTs

  E. Measured in time units of 1024 祍

  Correct Answer: DE

• Question 48:

  The IEEE 802.11 Dynamic Frequency Selection (DFS) service is capable of performing what functions? (Choose 2)

  A. Establishing an interference baseline on all 2.4 GHz channels

  B. Using modulation switching techniques to avoid interfering with radar systems

  C. Testing channels for radar before using a channel and while operating in a channel

  D. Suspending operations on a channel with high IEEE 802.11 co-channel interference

  E. Requesting and reporting of measurements in the current and other channels

  Correct Answer: CE

• Question 49:

  Which statements regarding an IEEE 802.11 Channel Switch Announcement frame are true? (Choose 2)

  A. Channel Switch Announcement frames use the Action frame body format.

  B. Channel Switch Announcement frames are the only place where the Channel Switch Announcement element is found.

  C. Channel Switch Announcement frames are transmitted and retransmitted on a channel until all associated STAs successfully move to the new channel.

  D. Channel Switch Announcement elements may be carried in Beacon management frames.

  E. In an infrastructure BSS, Channel Switch Announcement frames may be transmitted by either the AP or an associated STA.

  Correct Answer: AD

• Question 50:

  According to 802.11-2007, in what frame type(s) might you find the PMK Count and PMKID List fields?

  A. All frames that include the RSN IE

  B. Only (Re)Association Request frames

  C. Beacon and Probe Response frames

  D. EAPoL 4-Way Handshake frames

  E. Authentication and Association Request and Response frames

  Correct Answer: B