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NEW QUESTION 1
In the 2.4 GHz band, what data rate are Probe Requests usually sent at from an unassociated STA?

• A. The minimum basic rate
• B. 1 Mbps
• C. 6 Mbps
• D. MCS 0

Answer: B

NEW QUESTION 2
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

• A. Interview the network manager about the issues being experienced
• B. Talk to the end users about their experiences
• C. Observe the problem
• D. Obtain detailed knowledge of the wireless vendors debug and logging options

Answer: C

NEW QUESTION 3
In which element of a Beacon frame would you look to identify the current HT protection mode in which an AP is operating?

• A. HT Capabilities Element
• B. HT Protection Element
• C. HT Information Element
• D. HT Operations Element

Answer: C

NEW QUESTION 4
Which one of the following is not a valid acknowledgment frame?

• A. RTS
• B. CTS
• C. Ack
• D. Block Ack

Answer: C

NEW QUESTION 5
You have installed a new 802.11ac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing areA. While examining the waterfall plot you notice the airtime
utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?

• A. The AP is misconfigured and needs to be reconfigured to 80MHz operation
• B. RRM is enabled and has dynamically picked a 20 MHz channel
• C. The first 20 MHz is the AP’s primary channel and higher airtime utilization on the primary channel is normal when an AP Is configured for 80 MHz operation
• D. Non Wi-Fi interference is preventing the APs 80 MHz operation

Answer: C

NEW QUESTION 6
What does the value of the Listen Interval field in an Association request frame indicate?

• A. How long a STA performing active scanning will listen for Probe Responses before changing channels
• B. How often a STA will go off channel to look for other BSSs
• C. How often a STA in power save mode wakes up to listen to Beacon frames
• D. How long a STA waits for an Ack before retransmitting the frame

Answer: C

Explanation:
how often a STA in power save mode wakes to listen to Beacon management frames.

NEW QUESTION 7
Which one of the following is not an 802.11 Management frame?

• A. Action
• B. Authentication
• C. PS-Poll
• D. Beacon

Answer: C

NEW QUESTION 8
The PLCP sublayer provides framing by adding a header to create what type of data unit?

• A. MSDU
• B. MPDU
• C. PSDU
• D. PPDU

Answer: D

NEW QUESTION 9
When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?

• A. Frame body excluding the LLC
• B. Frame body including the LLC
• C. Frame body and MAC Header
• D. The whole MPDU

Answer: C

NEW QUESTION 10
As a wireless network consultant you have been called in to troubleshoot a high-priority issue for one of your customers. The customer’s office is based on two floors within a multi-tenant office block. On one of these floors (floor 5) users cannot connect to the wireless network. During their own testing the customer has discovered that users can connect on floor 6 but not when they move to the floor 5. This issue is affecting all users on floor 5 and having a negative effect on productivity.
To troubleshoot this issue, you perform both Spectrum and Protocol Analysis. The Spectrum Analysis shows the presence of Bluetooth signals which you have identified as coming from wireless mice. In the protocol analyzer you see the top frame on the network is Deauthentication frames. On closer investigation you see that the Deauthentication frames’ source addresses match the BSSISs of your customers APs and the destination address is FF:FF:FF:FF:FF:FF:FF.
What do you conclude from this troubleshooting exercise?

• A. The customer should replace all their Bluetooth wireless mice as they are stopping the users on floor 5 from connecting to the wireless network
• B. The users on floor 5 are being subjected to a denial of service attack, as this is happening across the entire floor it is likely to be a misconfigured WIPS solution belonging to the tenants on the floor below
• C. The customers APs are misbehaving and a technical support case should be open with the vendor
• D. The CCI from the APs on the floor 4 is the problem and you need to ask the tenant below to turn down their AP’s Tx power

Answer: A

NEW QUESTION 11
What is the formula used to calculate the Duration field value in an RTS frame?

• A. RTS Duration field = CTS duration
• B. RTS Duration field = Data or management to be sent frame duration
• C. RTS Duration field = Data or management frame to be sent duration + CTS duration + one ACK duration + three SIFS
• D. RTS Duration field = Data or management frame to be sent duration + CTS duration

Answer: C

NEW QUESTION 12
How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

• A. The VoIP phone transmits a PS-Poll frame
• B. The VoIP phone transmits a trigger frame
• C. The VoIP phone sets the More Data bit in the MAC Header to 1
• D. The VoIP phone The VoIP transmits a WMM Action frame

Answer: B

NEW QUESTION 13
What should the To DS and From DS flags be to set to in an Association Response frame?

• A. To DS = 0, From DS = 0
• B. To DS = 0, From DS = 1
• C. To DS = 1, From DS = 0
• D. To DS = 1, From DS = 1

Answer: A

NEW QUESTION 14
Which one of the best following is an advantage of using display filters instead of capture-time filters?

• A. Display filters allow for focused analysis on just the packets of interest
• B. Once created display filters are reusable for later captures
• C. Display filters only hide the packets from view and the filtered packets can be enabled for view later
• D. Multiple display filters can be applied simultaneously

Answer: A

Explanation:
display filters allow you to focus on things of interest and to ignore things you don't care about.

NEW QUESTION 15
You’re the WLAN administrator for a large retailer based at the HQ in New York. The London-based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?

• A. Access the microwave remotely and run a diagnostic check
• B. Ask a local member of staff to take some pictures of the microwave, including some close-ups of the door seal so that you can access it
• C. Place one of the London APs into spectrum analyzer mode and monitor the situation over lunch time
• D. Ask a local member of staff to change the frequency of the microwave and see if the disconnections stop

Answer: A

NEW QUESTION 16
When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?

• A. HT Protection Element
• B. HT Information Element
• C. HT Operation Element
• D. Non-HT Present Element

Answer: A

NEW QUESTION 17
An RST frame should be acknowledged by which frame?

• A. Ack
• B. CTS
• C. Block Ack
• D. RTS-Ack

Answer: A

NEW QUESTION 18
During a VHT Transmit Beamforming sounding exchange, the beamformee transmits a Compressed Beamforming frame to the beamformer. What is communicated within this Compressed Beamforming frame?

• A. Steering Matrix
• B. Beamforming Matrix
• C. Feedback Matrix
• D. Beamformee Matrix

Answer: C

NEW QUESTION 19
Which one of the following statements is not true concerning DTIMs?

• A. Buffered Broadcast and Multicast traffic will be transmitted following a DTIM
• B. The DTIM interval can dictate when an STA will wake up to listen to beacon frames
• C. DTIM stands for Delivery Traffic Indication Map
• D. Every Beacon frame must contain a DTIM

Answer: B

NEW QUESTION 20
Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the STA.
Less the 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still very low, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?

• A. There is a transmit power mismatch between the client and the AP and while the client can hear the Aps traffic, the AP cannot hear the client.
• B. The portable analyzer has a lower receive sensitivity than the AP and while it can’t capture the packets from the client STA, the AP can receive them OK.
• C. The STA is transmitting data using more spatial streams than the potable analyzer can support
• D. The portable analyzer is too close to the AP causing CCI, blinding the AP to the client’s packets

Answer: B

NEW QUESTION 21
Which one of the following should be the first step when troubleshooting a WLAN issue?

• A. Identify capture locations
• B. Identify probable causes
• C. Perform an initial WLAN scan and see if any obvious issues stand out
• D. Define the problem

Answer: D

NEW QUESTION 22
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