NEW QUESTION 1
What Interframe space would be expected between a CTS and a Data frame?

• A. SIFS
• B. DIFS
• C. AIFS
• D. PIFS

Answer: A

NEW QUESTION 2
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?

• A. Frame Body only
• B. Mac Header and Frame Body only
• C. PHY Header, MAC Header and Frame Body
• D. PHY Header and MAC Header only

Answer: B

NEW QUESTION 3
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 4
Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software?

• A. A supported WLAN adaptor with a customized driver
• B. Any 802.11 wireless adaptor
• C. A dual radio spectrum analyzer card
• D. SNMP read credentials to the WLAN controller or APs

Answer: C

NEW QUESTION 5
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 6
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 7
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 8
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 9
How many frames make up the Group Key Handshake excluding any Ack frames that may be required?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: D

NEW QUESTION 10
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 11
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 12
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 13
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 14
You are performing a multiple adapter channel aggregation capture to troubleshoot a VoIP roaming problem and would like to measure the roaming time from the last VoIP packet sent on the old AP’s channel to the first VoIP packet sent on the new AP’s channel. Which timing column in the packet view would measure this for you?

• A. Delta
• B. Absolute
• C. Roaming
• D. Relative

Answer: C

NEW QUESTION 15
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 16
Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?

• A. Supported Rates & Extended Supported Rates elements in a Beacon frame
• B. In the MBR Action frame
• C. In the Minimum Basic Rate Element in a Beacon frame
• D. In the MBR Information Element in an Association Response frame

Answer: A

NEW QUESTION 17
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 18
Which one of the following is not a valid acknowledgment frame?

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

Answer: C

NEW QUESTION 19
In a Spectrum Analyzer the Swept Spectrogram plot displays what information?

• A. The RF time domain
• B. RF power present at a particular frequency over the course of time
• C. Wi-Fi Device information
• D. Duty cycle in the frequency domain

Answer: D

NEW QUESTION 20
Which piece of information Is not transmitted in an HT PDDU header?

• A. Number of Spatial Streams
• B. PPDU length
• C. Channel number
• D. MCS index

Answer: D

NEW QUESTION 21
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