300-206 | Which three optons are benefts of U-APSD…

Question: 4

Which three optons are benefts of U-APSD? (Choose three.)

A. optmiied power-save mode periods
B. increased call capacity
C. bandwidth reservaton
D. synchroniiaton of the transmission and recepton of voice frames
E. efcient roaming
F. priority bandwidth and polling

Answer: A,B,D


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 times 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 stills 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 backof, thereby reducing the contention experience by call.

300-360 | An 802.11n implementation is being…

Question: 3

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,E

300-360 | Which three recommendations must….

Question: 2

Which three recommendations must be taken into consideration when an engineer is installing a new Voice WLAN? (Choose three.)

A. Use the Cisco wireless phone site survey client utility.
B. Use a separate Cisco Wireless Lan Controller.
C. Enable load balance on voice WLANs.
D. Maintain -67dBM as a minimal RSSI.
E. Set data for 2.4 GHz and voice for 5 GHz using separate SSIDs.
F. Enable lower data rates for 2.4-GHz data WLAN.

Answer: A,D,E

300-360 | Which two types of information must be…

Question: 1

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

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