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Q21. What is the optimal distance between APs for location services without considering the physical environment?
A. 10 to 25 feet
B. 90 to 120 feet
C. 50 to 70 feet
D. 80 to 100 feet
Answer: C
Explaination: Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/emob41dg/emob41dg-wrapper/ch13Loca.html
Q22. An engineer is performing a predictive wireless design for a Parts Distribution Center, which requires data and location services. Which three requirements are inputs to the design? (Choose three.)
A. access points with directional antennas
B. continuous -67 dBm coverage from one access point
C. overlapping -75 dBm coverage from three access points
D. overlapping -67 dBm coverage from two access points
E. access points in IPS mode
F. continuous -72 dBm coverage from one access point
G. access points in corners and along perimeters
Answer: B,C,G
Explanation: Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/WiFiLBS- DG/wifich5.html
Q23. The AP has been configured property for a VoWLAN survey The RF environment contains a noise of -87 to -90 dBm. What is the target value for the cell edge reading?
A. -62 dBm
B. -67 dBm
C. -60 dBm
D. -70 dBm
Answer: B
Q24. After the completion of a site survey with Ekahau Site Survey tool, using the default color palette, it is noted that multiple areas are shown as white on the heat map when viewing 5 GHz signal strength data. What does this indicate about the signal strength?
A. The area is below the minimum threshold configured on the tool.
B. The area is below the detectable level and indicates no RF signal.
C. The area is below -100 dBm at coverage cell edge.
D. The area is below -67 dBm at coverage cell edge.
Answer: A
Q25. A customer has deployed an N+N redundant wireless infrastructure. In this deployment, the access points have been salt and peppered between controllers. What configuration would be necessary to cut down on the use of mobility tunnels for voice clients?
A. mobility anchor
B. KIS based CAC
C. media session snooping
D. re-anchor roamed voice clients
Answer: D
Q26. Which two steps are associated with the active portion of the audit when a post-installation audit is performed with an auditing tool such as Ekahau? (Choose two.)
A. Check for co-channel interference by standing near an access point on one channel and watching for other access points that are on the same channel.
B. Verify smooth roaming.
C. Check to see if the signal level on other access points that are heard on the same channel is at least 19dBm weaker than the access point that you are next to.
D. Check that all channels are supported by the APs, regardless of client capabilities.
E. Verify that the network traffic of physical data rate and packet loss meets user requirements.
Answer: B,E
Q27. While performing a Layer 1 passive wireless site survey of a location an engineer detects several instances of low power frequency hopping interference, but cannot physically locate the interfering device or devices. Why is the engineer unable to locate the offending device or devices?
A. The sources are nearby narrow-beam radar and are sweeping through the facility.
B. The sources are PAN and are mobile.
C. The sources are above the ceiling file and transmit intermittently.
D. The sources are actually high-powered devices and transmit from off the site.
Answer: B
Q28. An engineer receives a digital image scanned from the floor plans of a facility to be surveyed for wireless survey and imported it into Air Magnet Pro. However, the document contains no scale. Which action can the engineer take to most accurately calibrate the size of the floor plan in Air Magnet?
A. Mark the length of a hallway, then count the ceiling tiles, multiply that number by 2 and enter that value.
B. Zoom in and mark across a hallway, then count the floor tiles across that hallway and enter that value.
C. Zoom in and mark a doorway, then size it at 3 feet because most doorways are 36 inches.
D. Mark the entire longest dimension of the floorplan, then use Google Earth to measure the correspondingoutside dimension and enter that value.
Answer: D
Q29. A customer is deploying a Greenfield 802.11ac network on a floor that will support approximately 300 wireless devices. Which setting needs to be changed on Prime Infrastructure Planning Tool in order to predict the amount of access points the customer needs to service the new floor?
A. Data Coverage Support Margin
B. Demand Settings
C. Add AP Field
D. 802.11n Protocol Support
Answer: B
Explanation: Reference: http://www.cisco.com/c/en/us/td/docs/wireless/prime_infrastructure/1-2/configuration/guide/pi_12_cg/maps.html#pgfId-1671104
Q30. An engineer is determining the signal levels for the wireless cells. Which signal-to-noise ratio is an optimal configuration to achieve?
A. minimum SNR of -33 dBm
B. minimum SNR of -25 dBm
C. minimum SNR of 25 dB
D. minimum SNR of 33 dB
Answer: C
Explanation:
The minimum recommended wireless signal strength for voice applications is -67 dBm and the minimum SNR is 25 dB.
Reference: http://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless-controllers/116057-sitesurvey-guidelines-wlan-00.html