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Q1. 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
Q2. 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
Q3. Which two types of information must be included in the installation inventory portion of the post-installation report? (Choose two.)
A. all AP, controller, and MSE administrator credentials
B. the names, locations, IP addresses, MAC addresses, etc. for every AP, controller, and MSE in the WLAN
C. a layout of the rack that the equipment is installed
D. results of the coverage audit performed with the site survey mapping tool
E. the number and type of all WLAN clients and tags
Answer: A,B
Q4. An engineer is planning for a 24 Mbps data rate for a new installation. What is the coverage area from the AP if the environment and other factors are not taken into consideration?
A. 225 feet
B. 80 feet
C. 150 feet
D. 100 feet
Answer: A
Q5. What is a common cause for signal attenuation?
A. Cinder block wall
B. Office window
C. Metal door
D. Glass wall
Answer: C
Q6. An engineer must design wireless coverage in thick-walled stairwells. Which information should the engineer refer to when determining where APs can be installed?
A. Local or National Building Code
B. IEEE
C. BICSI TDMM
D. Cisco Hardware Installation Guide
Answer: D
Q7. Which list of characteristics must all controllers in a mobility group have in common based on best practices?
A. mobility group name, version of controller code, Control and Provisioning of Wireless Access Points mode,ACLs, and WLANs (SSIDs)
B. mobility domain name, version of controller code, and Control and Provisioning of Wireless Access Pointsmode
C. mobility domain name, version of controller code, Control and Provisioning of Wireless Access Pointsmode, ACLs, and WLANs (SSIDs)
D. mobility group name, version of controller code, and Control and Provisioning of Wireless Access Pointsmode
Answer: A
Q8. An engineer is assigned to provide wireless coverage in a provincial capital building. Due to the age and historic nature of the building, the ability to run new copper Ethernet cable to desired AP locations is limited. Which requirement should the engineer specify to overcome this restriction?
A. Deploy access points where the survey indicates and connect them via fiber optic cable, using a mediaadapter, and locally provide power.
B. Deploy access points to each phone location converting two spare pairs of copper from the phone line toEthernet and locally provide power.
C. Deploy access point devices where limited cable can be run or exists and connect high- gain antennas andincrease Tx power to increase cell size.
D. Deploy RAP where limited cable can be run or exists, and extend coverage using MAP.
Answer: D
Q9. Which two best practices should be considered when a customer wants to purchase and implement Voice over Wireless for Cisco 7925 IP Phones? (Choose two.)
A. Enable lower data rates for 2.4-GHz data WLAN and higher data rates for phones.
B. Use a separate Cisco Wireless Lan Controller.
C. Enable 802.1x and Cisco Centralized Key Management for phone authentication.
D. Use dedicated Access Points only for Voice over Wireless.
E. Set data for 2.4 GHz and voice for 5 GHz using separate SSIDs.
Answer: C,E
Q10. A customer wants to implement a wireless network in a historic location, but is concerned about the structural and aesthetic impact to the facility. Which benefit of using wireless mesh addresses these concerns?
A. Power is required only at the installation location.
B. The APs do not have LED lights.
C. More wireless channels can be supported.
D. APs do not need network connections.
Answer: D
Q11. When designing a WLAN, AP placement is important. Which option describes how to rank the density of APs needed to support location services versus data and voice services?
A. Data services have the lowest density of APs compared to location services, which has the highest density.
B. Data services have a lower density of APs compared to location services, but more than voice.
C. Voice services have the highest density of APs over location and data services.
D. Voice and data services require a higher density of APs than location services.
Answer: A
Q12. Which three options are benefits of U-APSD? (Choose three.)
A. optimized power-save mode periods
B. increased call capacity
C. bandwidth reservation
D. synchronization of the transmission and reception of voice frames
E. efficient roaming
F. priority bandwidth and polling
Answer: A,B,D
Explanation:
Unscheduled automatic power-save delivery (U-APSD) is a feature that has two key benefits:
The primary benefit of U-APSD is that it allows the voice client to synchronize the transmission and reception of voice frames with the AP, thereby allowing the client to go into power-save mode between the transmission/reception of each voice frame tuple. The WLAN client frame transmission in the access categories supporting U-APSD triggers the AP to send any data frames queued for that WLAN client in that AC. A U-APSD client remains listening to the AP until it receives a frame from the AP with an end-of-service period (EOSP) bit set. This tells the client that it can now go back into its power-save mode. This triggering mechanism is considered a more efficient use of client power than the regular listening for beacons method, at a period controlled by the delivery traffic indication map (DTIM) interval, because the latency and jitter requirements of voice are such that a WVoIP client would either not be in power-save mode during a call, resulting in reduced talk times, or would use a short DTIM interval, resulting in reduced standby times. The use of U-APSD allows the use of long DTIM intervals to maximize standby time without sacrificing call quality. The U-APSD feature can be applied individually across access categories, allowing U-APSD can be applied to the voice ACs in the AP, but the other ACs still use the standard power save feature.
The secondary benefit of this feature is increased call capacity. The coupling of transmission buffered data frames from the AP with the triggering data frame from the WLAN client allows the frames from the AP to be sent without the accompanying interframe spacing and random backoff, thereby reducing the contention experience by call.
Reference:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/vowlan/41dg/vowlan41dg-book/vowlan_ch2.html#wp1045982
Q13. As part of a wireless site survey in a hospital, an engineer needs to identify potential Layer 1 interferers. In which three areas is the engineer most likely expect to find sources of 2.4 GHz and 5 GHz RF noise? (Choose three.)
A. emergency room
B. magnetic resonance imaging
C. laboratory
D. X-ray radiography
E. Gamma Knife radiation treatment
F. kitchen
Answer: A,C,F
Q14. When conducting a wireless survey at a customer facility, signal attenuation in an area that is surrounded by thick glass walls is noted as 2dB. When configuring Cisco Prime Infrastructure, which obstacle should be placed in a map editor to represent the impact the glass wall will have on the RF signal in the facility?
A. heavy door
B. thick wall
C. glass
D. light wall
Answer: D
Explanation: Reference: http://www.cisco.com/c/en/us/td/docs/wireless/prime_infrastructure/1-2/configuration/guide/pi_12_cg/maps.html Table 6-4
Q15. 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
Q16. What is the optimal distance between APs for location services without considering the physical environment?
A. 10 to 25 feet
B. 90 to 120 feetÂ
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
Q17. A Cisco 7925 phone at a client’s location is not registering with CUCM. The engineer analyzes a packet capture, sees that the phone receives an IP, and downloads the proper configuration file from TFTP successfully. What type of messages should the phone be sending at this point?
A. H.245
B. H.323
C. MCGP
D. SCCP
Answer: D
Q18. An 802.11n implementation is being discussed. Users are satisfied with the potential 300- 450 Mbps throughput of new 802.11n APs. Which three bandwidth requirements are used to calculate per client bandwidth through an 802.11n AP network? (Choose three.)
A. 450 Mbps throughput is the client max for 5-GHz radio.
B. Channel bonding on 5 GHz is required for a client to have a 300 Mbps WiFi link.
C. 300 Mbps throughput is the client max for 2.4-GHz radio.
D. The remaining bandwidth is divided per device when more clients are connected to one AP.
E. 100 Mbps Ethernet switch port is a potential bottleneck.
F. CleanAir helps clear noise for 802.11n channel bonding to work.
Answer: A,C,D