Which one of the following portions of information is communicated in the PHY Header?
A . Signal strength
B . Date rate
C . SNR
D . Noise
Answer: D
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?
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
Which piece of information Is not transmitted in an HT PDDU header?
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
Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?
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
What do you conclude about this frame?
After examining a Beacon frame decode you see the SSID Element has a length of 0.
What do you conclude about this frame?
A . The frame is corrupted
B . This is a common attack on WISP backend SQL databases
C . The beacon is from a BSS configured to hide the SSID
D . SSID elements always have a length of 0
Answer: C
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?
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
Which of the following issues did you identify from the spectrum analysis?
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?
A . The tablets are entering power save mode and failing to wake up to receive the access points
transmissions
B . A high noise floor has resulted in a SNR of less than 20%
C . The tablets are connecting to the wrong SSID
D . There is a power mismatch between the APs and the clients
Answer: A
What do you conclude?
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
When performing packet capture (in a non-FT environment) which frames are required in order for PSK frame decryption to be possible?
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
Which one of the best following is an advantage of using display filters instead of capture-time filters?
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.
Reference: https://searchnetworking.techtarget.com/tip/How-to-manage-Wireshark-display-filters