NEW QUESTION 1
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 2
What is the function of the PHY Preamble?

• A. To set the modulation method for the MPDU
• B. Allows the receiver to detect and synchronize with the signal
• C. To terminate a conversation between transmitter and receiver
• D. Carries the NDP used in Transmit Beamforming and MU-MIMO

Answer: B

NEW QUESTION 3
Given a protocol analyzer can decrypt WPA2-PSK data packets providing the PSK and SSID are configured in the analyzer software.
When performing packet capture (in a non-FT environment) which frames are required in order for PSK frame decryption to be possible?

• A. Authentication
• B. Reassociation
• C. 4-Way Handshake
• D. Probe Response

Answer: C

NEW QUESTION 4
A client is operating in an unstable RF environment. Out of five data frames transmitted to the client it only receives four. The client sends a Block Ack to acknowledge the receipt of these four frames but due to frame corruption the Block Ack is not received by the AP. Which frames will be transmitted?

• A. Only the data frame which was corrupted
• B. Both the corrupted data and Block Ack
• C. All data frames
• D. Only the Block Ack

Answer: D

NEW QUESTION 5
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 6
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 7
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 8
You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?

• A. Look for gaps in the sequence number in MAC header
• B. Protocol Analyzers show the number of missing packets in their statistics view
• C. Retransmission are an indication of missing packets
• D. The missing packets will be shown as CRC errored packets

Answer: C

NEW QUESTION 9
Finish the statement. It is possible to distinguish between _____ and _______ 20 MHz transmissions when looking at an FFT plot.

• A. HR/DSSS and ERP
• B. ERP and VHT
• C. HT and VHT
• D. OFDM and HT

Answer: C

NEW QUESTION 10
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 11
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 12
Which common feature of a Spectrum Analyzer would be the best to help you locate a non-802.11 interference source?

• A. Max hold
• B. Location filter
• C. Waterfall plot
• D. Device finder

Answer: D

NEW QUESTION 13
A PHY Header is added to the PSDU at which sub-layer?

• A. LLC
• B. MAC
• C. PLCP
• D. PMD

Answer: C

Explanation:
The PLCP adds a preamble and PHY header to the PSDU.

NEW QUESTION 14
802.11 k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?

• A. RRM
• B. Action
• C. Beacon
• D. Reassociation Request and Reassociation Response

Answer: C

NEW QUESTION 15
What is encrypted within the fourth frame of the 4-Way Handshake?

• A. PMK
• B. PTK
• C. GMK
• D. GTK

Answer: D

NEW QUESTION 16
Which one of the following statements describes the function of WMM Admission Control?

• A. APs guarantee Voice and Video access categories priority over the WLAN medium
• B. APs control access to the wireless medium by polling STAs for data packets
• C. APs regulate the available bandwidth in an attempt to provide a guarantee of the amount of time that a STA has available to access the channel
• D. Provides a new 802.11 Authentication method for Voice devices

Answer: A

NEW QUESTION 17
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?

• A. Only Control frames have a Frame Control field
• B. The Frame Control field contains three sub-fields and eight one-bit flags
• C. The Frame Control field is used to communicate the duration value
• D. The Frame Control field is always set to 0

Answer: D

Explanation:
This field is simply used to indicate which protocol version of 802.11 is being used by the frame. This is always set to “0”

NEW QUESTION 18
ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interface with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?

• A. Do the ZigBee channels used by the lightning system overlap with the WLAN channels?
• B. Is the ZigBee system using more the 50% of the available airtime?
• C. Is the ZigBee system causing an increase in WLAN retries?
• D. Is the WLAN corrupting ZigBee system messages?

Answer: C

NEW QUESTION 19
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 20
What is the function of 802.11 Management frames?

• A. Manage the BSS
• B. Manage the flow of data
• C. Communicate configuration changes between WLAN controller and APs
• D. Prioritize network administration traffic

Answer: C

NEW QUESTION 21
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an AMPDU?

• A. The HT Operation Element
• B. A-MPDU flag in the HT Control Field
• C. A-MPDU flag in the Frame Control Field
• D. The Aggregation flag in the Radio Tap Header

Answer: B

NEW QUESTION 22
What is the difference between a Data frame and a QoS-Data frame?

• A. QoS Data frames include a QoS control field
• B. QoS Data frames include a QoS information element
• C. QoS Data frames include a DSCP control field
• D. QoS Data frames include an 802.1Q VLAN tag

Answer: A

NEW QUESTION 23
When would you expect to see a Reassociation Request frame?

• A. Every time a STA associates to an AP to which it has previously been associated
• B. Only when a STA is using FT roaming
• C. Only when a STA roams back to an AP it has previously been associated with
• D. Every time a STA roams

Answer: D

NEW QUESTION 24
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 25
......