Exam : CENP PW0-300
Title : Certified Wireless Network Expert

1. In a Split MAC wireless network architecture, lightweight APs map user priorities (UPs) specified by the QoS STA on incoming frames to ___________.
A. IEEE 802.1D Frame Precedence Values
B. GRE Priority Bits
C. IEEE 802.1Q Tag Protocol Identifiers
D. IP Differentiated Services Code Points
E. QoS Control Header Values
Answer: D

2. A QoS STA obtains a TXOP for an access category (AC) after what two parameters are met?
A. After a scheduled service period ends
B. The medium is idle at the AIFS[AC] slot boundary
C. The backoff time for that AC has expired
D. After a Block ACK Response
E. After a Target Beacon Transmission Time (TBTT)
Answer: BC

3. Given: When the delayed Block Ack policy is used between two QoS STAs, the recipient must respond to a BlockAckReq frame with an ACK frame. The recipient must then send its BlockAck response frame in a subsequently obtained TXOP.
Once the contents of the BlockAck frame have been prepared, the recipient must _______________.
A. Send the BlockAck response frame to the originator in the earliest possible TXOP using the highest priority AC.
B. Send an ATIM to the originator signifying that the BlockAck response frame is ready for transmission.
C. Include the TID of the BlockAckReq in the next TXOP Request to the HC.
D. Wait for one PIFS after the next Beacon and transmit the BlockAck response to the originator using the same AC as the BlockAckReq frame.
Answer: A

4. Given: An ingress frame arrives on the Ethernet port of an autonomous AP marked with an IEEE 801D user priority value.
Which IEEE 802.1D user priority values (by name) will assure the data payload carried by the Ethernet frame gets assigned to the highest priority WMM queue?
A. Controlled Load
B. Network Control
C. Video
D. Voice
E. Best Effort
F. Excellent Effort
Answer: BD

5. When using a protocol analyzer to capture conversations over a WLAN, you may often encounter encrypted data frames. Most WLAN protocol analyzers have a feature that allows the analyst to save and reload the captured frames into memory at a later time. Using this functionality, what task can be performed?
A. When IEEE 802.1X/LEAP is being used as the WLAN security mechanism, the authentication response frame can be replayed from a saved trace file at a later time to successfully authenticate a hacker.
B. If a user name and password for an IEEE 802.1X/EAP-TTLS security implementation can be obtained through social engineering tactics, the user name and password can be entered into the analyzer to decrypt the frames from a saved trace file.
C. An analyst can search through the captured frames looking for RADIUS frames that will disclose the user’s password.
D. Encrypted frames may be decrypted offline, after they are captured, by entering a WEP key or WPA passphrase into the analyzer.
Answer: D

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