Question 1.
A QoS STA is permitted to send which frame types of a Hybrid Coordinator?

A. QoS Data + CF-ACK + CF-Poll
B. Data + CF - Poll
C. QoS Null
D. PS-Poll
E. CF-End + CF -Ack

Answer: C, D

Question 2.
WMM-PS trigger frames can be what type of IEEE 802.11 frames?

A. Reassociation
B. PS-Poll
C. QoS Data
D. QoS + CF-Poll
E. QoS Null
F. CTS

Answer: C, E

Question 3.
Given: ITCertKeys.com has an IEEE 802.11 WLAN secured by strong authentication (PEAP-EAP-MSCHAPv2) and encryption (CCMP/AES). They wish to implement wVoIP phones but have notices that the phones they have selected only supports WPA-Personal using TKIP/RC4.

How can ITCertKeys.com maintain their current level of data security while allowing the wVoIP phones network access?

A. Enable application layer encryption for the voice protocol and implement a wireless intrusion 
    prevention system (WIPS) on the wVoIP network segment
B. Use a secure DHCP server that can restrict access to layer 3 addresses based on user 
    authentication
C. Use MAC filtering to the network segment where the wVoIP phones will be used
D. Use a separate SSID for the wVoIP phones and map this new SSID to a separate VLAN on 
    the wired infrastructure
E. Using RBAC, allow only the appropriate voice protocol (SIP, H.323 etc) to a specific 
    destination address on the network segment where the wVoIP phones will be used

Answer: D, E

Question 4:
On an Enterprise IEEE 802.11 WLAN supporting both voice and data, why is WPA2-Personal security often preferred over WPA2-Enterprise Security for voice-enabled devices?

A. WPA2-Personal imposes less encryption overhead than WPA2-Enterprise, resulting in better 
    performance
B. WPA2-Personal is more easily configured on the voice-enabled client devices than WPA2-
    Enterprise
C. WPA2-Personal supports IEEE 802.11 fast/secure roaming between access points, whereas 
    WPA2-Enterpise deployments may not
D. Voice-enabled devices uses application layer (L7) security mechanism, minimizing the need 
    for scalable data link (L2) security
E. WPA2-Enterprise voice-enabled devices consume battery life at rate of almost double that of 
    WAP2-Personal

Answer: C

Question 5.
Given: An ingress frame arrives on the Ethernet port of an autonomous AP marked with an IEEE 802.1D 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. Voice
B. Network Control
C. Best Effort
D. Controlled Load
E. Video

Answer: A, B

Question 6.
A QoS STA obtains a TXOP for an access category (AC) after what two parameters are met?

A. After a Block ACK Response
B. After a scheduled service period ends
C. The medium is idle at the AIFS[AC] slot boundary
D. After a Target Beacon Transmission Time (TBTT)
E. The backoff time for that AC has expired

Answer: C, E

Question 7.
Given: An EDCA QoS BSS is operating as a Robust Security Network (RSN). Two QoS STAs in the QoS BSS are using a Direct Link to communicate.

When the RTS/CTS threshold is exceeded for a frame to be transmitted between the two QoS STAs, what is the frame exchange sequence, including interframe spaces?

A. AIFS-RTS-SIFS-CTS-SIFS-DATA-SIFS-ACK
B. AIFS-RTS-SIFS-CTS-DIFS-DATA-SIFS-ACK
C. DIFS-RTS-CTS-SIFS-DATA-SIFS-ACK
D. RIFS-RTS-SIFS-CTS-SIFS-DATA-SIFS-ACK
E. DIFS-RTS-SIFS-ACK-SIFS-CTS-SIFS-ACK-SIFS-DATA-SIFS-ACK

Answer: A

Question 8.
All successful frame transmissions within an EDCA TXOP are separated by what IEEE 802.11 entity?

A. TBTT
B. ACK
C. SIFS
D. AIFS
E. PIFS
F. CAP

Answer: C

Question 9.
Given: ITCertKeys.com has recently installed its first access point. The access point is an ERP unit and both ERP and HR-DSSS client stations will be used on the wireless network simultaneously. The network administrator has appropriately configured the access point and all of the company's HR-DSSS wireless client stations to use short preambles for CCK transmissions. A visitor begins using a Personal Data Assistant (PDA) with an integrated HR-DSSS radio configured for use of long preambles on ABC's wireless network

Which statement describes what the network administrator will se with a wireless protocol analyzer?

A. Once the visitor's PDA is associated to the access point, all HR-DSSS stations associated to 
    the access point will being using long preambles
B. The visitor's PDA will communicate with the access point using long preambles and the access 
    point will communicate with all other client stations using short preambles
C. The visitor's PDA will not be able to associate to the wireless network and it will cause 
    significant interference for other wireless stations
D. The visitor's PDA will associate to the access point using MMPDUs with long preambles but 
    then begin sending Data frames using short preambles since data frames can't use long 
    preambles

Answer: A

Question 10.
Given: Shown are frames captured from an IEEE 80.1X/LEAP authentication. This WLAN is a Robust Security network (RSN) using the CCMP cipher suite.
Exhibit:
 
Using the information given in the screenshot, calculate how long it takes for only the frames that are part of the 4-Way handshake to complete.

A. 210.443 ms
B. 243.743 ms
C. 3.018 ms
D. 5.820 ms
E. 237.753 ms

Answer: D

Question 11.
An HR-DSSS STA does not receive an ACK for a first-attempt data frame that is transmitted. In this case, what happens to the STA's DCF contention window?

A. The contention window is not affected by failed Data Frame Deliveries
B. The contention window is immediately closed and the frame is retransmitted
C. The contention window approximately doubles in size
D. The slot time within the contention window decreases by 50%
E. It varies because the backoff algorithm is random

Answer: C

Question 12.
Which statement are true regarding frame acknowledgement in an IEEE 802.11 WLAN?

A. A client station's Reassociation Request frames are only acknowledged with a Reassociation 
    Response from the access point when roaming in a WLAN secured with IEEE 802.1X/EAP
B. ACK frames following Data frames with the more fragments bit set to 1 set the NAV of 
    competing stations for a duration value equal to two SIFS plus the next Data fragment and its 
    ACK
C. Probe Request acknowledgement (sending of a Probe Response frame) is configurable in the 
    access point and is always linked to SSID broadcast configuration in Beacons
D. Data Frame fragments are acknowledged individually ( with an ACK frame)
E. In a EDCA BSS, encrypted Data frames are only acknowledged by client stations, never by 
   access points

Answer: B, D

	Web www.certsbraindumps.com