EMT Practice Test

1. Question Content...

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Question1: How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

Question2: Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?

Question3: Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A- MPDU?

Question4: Finish the statement. It is possible to distinguish between _______and ______20 MHz transmissions when looking at an FFT plot.

Question5: Which one of the following is not a valid reason for an AP to fail a STAs association?

Question6: When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?

Question7: An RST frame should be acknowledged by which frame?

Question8: In which element of a Beacon frame would you look to identify the current HT protection mode in which an AP is operating?

Question9: Which one of the following portions of information is communicated in the PHY Header?

Question10: Which one of the following is not an 802.11 Management frame?

Question11: What should the To DS and From DS flags be to set to in an Association Response frame?

Question12: 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?

Question13: When configuring a long term, forensic packet capture and saving all packets to disk which of the following is not a consideration?

Question14: In a Spectrum Analyzer the Swept Spectrogram plot displays what information?

Question15: 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?

Question16: Why would a STA that supports 802.11k Radio Measurement send a Neighbor Request to an AP?

Question17: Prior to a retransmission what happens to the CWmax value?

Question18: After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?

Question19: What is the difference between a Data frame and a QoS-Data frame?

Question20: Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?

Question21: 802.11k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?

Question22: In the 2.4 GHz band, what data rate are Probe Requests usually sent at from an unassociated STA?

Question23: The PLCP sublayer provides framing by adding a header to create what type of data unit?

Question24: Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software?

Question25: The network administrator at ABC Engineering has taken a large packet capture from one of their APs running in monitor mode. She has very little knowledge of 802.11 protocols but would like to use the capture file to evaluate the overall health and performance of their wireless network. When she asks your advice, which tool do you recommend she opens the packet capture file with?

Question26: Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?

Question27: What does the value of the Listen Interval field in an Association request frame indicate?

Question28: Which one of the following should be the first step when troubleshooting a WLAN issue?

Question29: 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?