EMT Practice Test

1. Question Content...

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Question1: What does the value of the Listen Interval field in an Association Request frame indicate?

Question2: Finish the statement:
It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.

Question3: What is used to respond with an uplink transmission to an MU-RTS trigger frame in the 802.11ax PHY?

Question4: When would you expect to see a Reassociation Request frame'

Question5: An RTS frame should be acknowledged by which frame?

Question6: 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?

Question7: 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 than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?

Question8: Protocol analyzers may present field values in either binary, decimal or hexadecimal. What preceeds a hexadecimal value to indicate it is hexadecimal?

Question9: What is an AIFS?

Question10: Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A-MPDU?

Question11: After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?

Question12: 802.11k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?

Question13: A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources.
From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?

Question14: Which one of the following is not a valid acknowledgement frame?

Question15: In what scenario is Open Authentication without encryption not allowed based on the 802.11 standard?

Question16: Which one of the following is not an 802.11 Management frame?

Question17: Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software in addition to the spectrum analysis adapter?

Question18: You have installed a new 802.1 lac 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?

Question19: Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

Question20: What should the To DS and From DS flags be to set to in an Association Response frame?

Question21: Which common feature of a Spectrum Analyzer would be the best to help you locate a non-802.11 interference source?

Question22: When configuring a long-term, forensic packet capture and saving all packets to disk which of the following is not a consideration?

Question23: What is the function of the PHY layer?

Question24: When performing protocol analysis, you capture an 802.1 lac data frame on channel 52, transmitted at MCS 8.
At what data rate was the PHY Preamble transmitted?

Question25: How many frames are exchanged for 802.11 authentication in the 6 GHz band when WPA3-Enterprise is not used, and a passphrase is used instead?