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QUESTION 16
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: ABD
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.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/vowlan/41dg/vowlan41dg-book/vowlan_ch2.html#wp1045982
QUESTION 17
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.
http://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless-controllers/116057-sitesurvey-guidelines-wlan-00.html
QUESTION 18
A hospital environment was designed to guarantee RF coverage at or better than -67 dBm in the 5 GHz spectrum. The customer mandates that RRM be used for DCA and TPC in both bands. After deployment, why do many of the legacy 802.11b/g devices have difficulty maintaining connectivity?
A. Excessive co-channel interference in the 2.4 GHz band exists.
B. Excessive overlapping channels in the 2.4 GHz band exists.
C. TPC drastically reduces Tx power in the 2.4 GHz band.
D. TCP drastically increases Tx power in the 2.4 GHz band.
Answer: C
QUESTION 19
An engineer installed a 3702 AP and is getting power from the switch. What is the reason for getting 3×3 MIMO instead of 4×4?
A. 802.1p
B. 802.3af
C. 802.11e
D. 802.3at
Answer: B
QUESTION 20
An engineer is preparing for an indoor wireless LAN survey and is provisioning a survey kit. Which three pieces of equipment should be included? (Choose three.)
A. external connector access point
B. integrated antenna access point
C. coax low-loss cable
D. battery operated power supply
E. range finder
F. Yagi antennas
Answer: BDE
QUESTION 21
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
QUESTION 22
An engineer is preparing for an active site survey of a warehouse and is informed that they should not enter any areas that are blocked by supplies that are difficult to move. Which option describes how the engineer should address this restriction?
A. Extrapolate restricted access areas by drawing circles for AP coverage.
B. Survey hallways, common areas, and storerooms.
C. Utilize a predictive tool to define coverage in off-limits areas.
D. Educate the customer about the importance of accurate and complete measurements.
Answer: D
QUESTION 23
A customer has a business-critical voice network and wants to be alerted whenever voice clients move out of a coverage area and experience RSSI below -67 dBm on the 5 GHz band. Which option can be configured on the wireless controller to alert network administrators when this limit is surpassed?
A. EDCA; voice optimized
B. SIP voice sample interval
C. 802.11a voice RSSI coverage threshold
D. traffic stream metrics
Answer: C
QUESTION 24
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: BE
QUESTION 25
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
QUESTION 26
Cisco 7925G phones are experiencing intermittent connectivity issues. The wireless survey reveals that the facility has no current coverage holes. The radios on the 2.4GHz channel have all been statically set to power level 1. Which two reasons could explain why the phones are having issues on this wireless network? (Choose two.)
A. The phones are experiencing excessive co-channel interference.
B. The phones only operate on the 2.4 GHz band when the power level is above 25 mW.
C. The phones are not transmitting at the same power levels as the access points.
D. The phones are experiencing delays of less than 30 ms within their coverage cell.
E. The phones are receiving greater than -67 dBm RSSI on the 2.4 GHz band.
Answer: AC
QUESTION 27
An engineer would like to calibrate the RF environment to improve accuracy. Which wireless attribute is added to the floor-level calculation by calibrating the floor?
A. attenuation
B. TX power
C. multipath
D. SNR
Answer: A
QUESTION 28
An engineer is deploying an outdoor Mesh network. Which four major factors should be considered? (Choose four.)
A. power
B. buildings
C. traffic lights
D. satellite dishes
E. line of sight
F. network connectivity
G. power lines
H. mounting
Answer: AEFH
QUESTION 29
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: BCG
Explanation:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/WiFiLBS-DG/wifich5.html
QUESTION 30
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
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