CWNA.ActualTests.PW0-250.v2012-01-02.by.Erik€¦ · CWNA PW0-250 Exam - The central part of the warehouse is between 400 and 600 feet (122 to 183 meters) from the warehouse switches

CWDP

Number: PW0-250Passing Score: 800Time Limit: 120 minFile Version: 1.0

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CWNA PW0-250

Certified Wireless Design Professional (CWDP)

Version: 4.0CWNA PW0-250 Exam

Exam A

QUESTION 1After surveying for the ideal mounting locations for APs, you have been asked to compromise RFpropagation optimization due to aesthetic concerns raised by your customer. In the end, you've decided tomount the APs in the ideal locations and paint the APs so they go unnoticed in the environment.

What is a valid recommendation or consideration when painting APs? (Choose 2)

A. Always use paints with metallic dye in them to prevent potential RF propagation impact.B. Do not paint the notification LEDs on the AP, but configure them to be dim or turned off altogether until

troubleshooting is required.C. Painting APs may void the product manufacturer's warranty.D. Most AP models for indoor environments come in a variety of form factors and colors. Painting is never

recommended.E. Painting APs always introduces a fire and gas emissions hazard and should be avoided for all indoor

APs.

Correct Answer: BCSection: (none)Explanation

Explanation/Reference:Explanation:

QUESTION 2When deploying long-distance 802.11 bridge links (10 miles / 16 km), what parameter may be critical forimproving data flow by reducing retries caused by the long distances?

A. The sequence control field valueB. The acknowledgement timeout thresholdC. The minimum transmit data rate valueD. The CTS-to-self thresholdE. The Beacon intervalF. The PHY parameter set field

Correct Answer: BSection: (none)Explanation


QUESTION 3One of your customers plans on providing wireless coverage to a warehouse facility. After performing aninitial walkthrough, you collect the following information:

"Pass Any Exam. Any Time." - www.actualtests.com 2CWNA PW0-250 Exam- The central part of the warehouse is between 400 and 600 feet (122 to 183 meters) from the warehouseswitches mounted on the walls.- The warehouse map was provided by the customer and is displayed in the exhibit.- The warehouse storage is composed of metallic racks with varying inventory levels and contents, fromelectronics and plastic toys to food pallets and juice bottles.- Workers need basic data coverage from their working location, and are not highly mobile. They usuallywork from one single aisle, and their laptop is on a cart with wheels.

What would be your recommendation to provide coverage to the central area (indicated by a blue circle) ofthe warehouse?

A. Equip workers laptops with a directional antenna and install APs less than 328 feet (100m) away fromthe switch.

B. In this case, extend the cable length just beyond 328 feet (100 m) and position APs as close as possibleto the central area of the warehouse.

C. Position APs along the walls, and equip the APs with Yagi antennas to cover the central area.D. Install APs for client access in the central area and use a mesh backhaul link to connect to the DS.

Correct Answer: DSection: (none)Explanation


"Pass Any Exam. Any Time." - www.actualtests.com 3CWNA PW0-250 Exam

QUESTION 4Which definition correctly describes the "local MAC" variation of the centralized WLAN architecture?


A. All MAC functions are performed by the AP. A minimal subset of network control is offloaded to theWLAN controller along with management and monitoring functions.

B. PHY functions are performed directly by the AP. MAC functions are divided almost equally between theWLAN controller and the AP, according to the time sensitivity of the feature or service.

C. The AP provides the RF termination point for the WLAN, but performs very few of the WLAN functionsor services. The WLAN controller performs all MAC functions and the AP is very simple and lightweight.

D. All RF-, data-, and control-related WLAN functions are performed by the AP. APs coordinate networkservices with one another and are managed by a WNMS, so no WLAN controller is used in thisarchitecture.

Correct Answer: ASection: (none)Explanation


QUESTION 5When a WLAN controller transmits an Ethernet frame that has an IEEE 802.11 frame as its payload to alightweight AP, what type of QoS marks can be applied to the Ethernet frame and/or its payload? (Choose3)

A. IEEE 802.1Q PCP marks in the Ethernet frame headerB. User Priority marks in the IEEE 802.11 frame headerC. Throughput subscription marks in the Ethernet frame headerD. MPLS tags from the Label Edge Router (LER)E. DSCP marks to the ToS bits in the encapsulating IP packet headerF. RSVP tag if RTP is the payload of the IEEE 802.11 frame

Correct Answer: ABESection: (none)Explanation


QUESTION 6In a centralized WLAN architecture, what new problem may arise when you change the data forwardingmodel from centralized to distributed? (Choose 2)


A. APs that were designed for a centralized forwarding model may not support all features in distributedforwarding mode.

B. The Ethernet switch ports to which APs are connected may need to be reconfigured to support VLANtagging and QoS at the network edge.

C. All RRM controls will also need to be distributed to a master AP that acts as a channel and transmitpower arbiter for other APs in the ESS.

D. Centralized control functions, such as key management and distribution, RRM, and load balancing willno longer be supported.

E. APs will not have the processing capabilities to support AES-CCMP, so TKIP will be the recommendedencryption method.

Correct Answer: ABSection: (none)Explanation


QUESTION 7Your customer location is equipped with DAS, originally deployed to relay a GSM signal indoors and provide802.11 data coverage to static stations. What type of wireless application would be least likely to besupported by this RF distribution model?

A. On-demand video streaming over wirelessB. Data connection with frequent roamingC. Location-based services for wireless assets or RFID tagsD. VoWLAN if the codec is G.729.E. FTP over implicit TLS/SSL

Correct Answer: CSection: (none)Explanation


QUESTION 8In a manufacturing facility with highly reflective materials, you are planning an upgrade to your existing802.11b solution. You have chosen a dual-band 802.11n infrastructure product for this purpose. Your clientapplications include:

Handheld scanners -- for inventory management

Toughbooks (laptops) -- mounted on forklifts for inventory and workflow management

VoWiFi phones -- used by select employees throughout the facility

"Pass Any Exam. Any Time." - www.actualtests.com 5CWNA PW0-250 ExamYou are evaluating all of the 802.11n enhancements and determining which features to enable for yourenvironment and applications.

In this scenario, what 802.11n enhancements should NOT be enabled on the 2.4 GHz radio of the newAPs? (Choose 2)

A. 40 MHz channelsB. Short guard intervalsC. Block AcknowledgmentsD. Frame aggregationE. MRCF. STBC

Correct Answer: ABSection: (none)Explanation


QUESTION 9According to WLAN security design best practices, what is true of the EAP properties shown in the exhibit?

A. The "Validate server certificate" checkbox should be checked if you purchased a third-party SSLcertificate for the AS, but left unchecked if you have a self-signed certificate for the AS.

B. The "Validate server certificate" checkbox should always be checked to prevent MITM attacks fromrogue authentication servers."Pass Any Exam. Any Time." - www.actualtests.com 6CWNA PW0-250 Exam

C. The "Trusted Root Certification Authorities" list is provided to identify the certificate that the client shouldsend to the AS for client authentication.

D. The "Do not prompt user to authorize new servers or trusted certification authorities" box should bechecked only for administrative users.

E. The "Enable Identity Privacy" checkbox and anonymous name field are only useful for networkssupporting EAP-LEAP.



QUESTION 10Given: Use Exhibit 1, 2, and 3 to answer the question.


The azimuth and elevation charts for which type of antenna are shown in Exhibit 1?

A. Figure 1B. Figure 2C. Figure 3D. Figure 4E. Figure 5F. Figure 6



QUESTION 11Multicast video applications typically require special treatment on the Wi-Fi network due to the nature ofmulticast traffic. Many vendors implement proprietary multicast-to-unicast conversion for this reason.

Which of the following is NOT a valid reason for special unicast conversion of downlink multicast traffic?

A. In QoS WLANs, multicast traffic is always assigned to the best effort (AC_BE) transmit queue.B. Group addressed downlink frames are not acknowledged on the wireless medium.C. Multicast traffic must always be transmitted via omnidirectional antennas.D. Frames with a group receiver address must always be sent at a rate in the Basic Rate Set.




QUESTION 12Given: Assume that music on hold (MOH) features are unicast only.

What VoWiFi implementations require multicast packet delivery support by the WLAN infrastructure?

A. All VoWiFi implementationsB. Push-to-Talk VoWiFi phonesC. VoWiFi soft phonesD. FMC phonesE. Flat (non-VLAN) VoWiFi implementations



QUESTION 13As you plan a WLAN upgrade, you have assessed the network requirements and data signatures of yourapplications. One of the popular applications used on your network requires high bandwidth and low tomedium Wi-Fi loss, but can tolerate moderate latency and jitter.

What application matches this description?

A. VoiceB. EmailC. Skype chatD. Video-on-demandE. Video conferencingF. FTP



QUESTION 14Given: The 802.11n APs you have selected for your public access deployment support many of the PHYand MAC enhancements offered by the 802.11n standard. The AP is single-band (2.4

"Pass Any Exam. Any Time." - www.actualtests.com 9CWNA PW0-250 ExamGHz) and only allows 20 MHz channels. The WLAN radio in the AP is a 3x3 802.11n chip that supports twospatial streams.

What is the maximum MCS rate that could be supported by this AP?

A. 54 MbpsB. 65 MbpsC. 108 MbpsD. 144 MbpsE. 150 MbpsF. 300 Mbps



QUESTION 15As an implementation engineer, you have just received initial design specs from a network designer for yourdual-band 802.11n deployment. The network design documents prescribe the following data rateconfiguration for the 2.4 GHz radio:

Basic Rates -- 5.5, 6, 11, 12 Mbps

Supported Rates --9, 18, 24, 36, 48, and 54 Mbps as well as MCS 0-15

What will result from this design strategy?

A. By disabling support for 1 and 2 Mbps while allowing 5.5 and 11 Mbps, the network will force 802.11bclients to use these higher data rates.

B. Protection mechanisms will always be in use on this network to support 5.5 and 11 Mbps as basic rates.C. HR/DSSS (802.11b) stations will not be able to associate to the service set.D. This configuration violates the IEEE specification that defines 6, 12, and 24 Mbps as mandatory data

rates for 802.11g/n.E. MCS 0 will represent the lowest data rate that can be used in the service set.

Correct Answer: CSection: (none)

Explanation



QUESTION 16Given: As the wireless network administrator for XYZ Company, you are planning to upgrade your agingwireless network infrastructure, as well as some clients, to support 802.11n. In your research, you havediscovered that your new wireless client devices and infrastructure are 802.11n, WMM, and WMM-PScertified by the Wi-Fi Alliance. Some of your existing client devices are 802.11a/b/g devices that do notsupport WMM.

Given this information, what scenario is possible when your company's employees begin using both typesof client devices on the new WLAN?

A. All WMM-PS certified client devices will be prevented from utilizing WMM-PS features until all stations inuse on the wireless medium are WMM-PS certified.

B. The WLAN infrastructure will set the dozing times of the WMM-PS certified client devices based upontheir WMM access category, while the non-WMM-PS client devices will continue to use PS- Poll frames.

C. Performance and battery life will be inconsistent between WMM-PS and non-WMM-PS client deviceswhen used with applications that support WMM-PS.

D. WMM-PS enabled APs will allow both WMM-PS and non-WMM-PS stations to use the trigger- and-delivery mechanism, but WMM-PS stations will get priority.

E. When all STAs are using Power Save features, WMM-PS STAs will experience poor performance dueto PS protection mechanisms.



QUESTION 17To achieve a 450 Mbps MCS, what 802.11n features (from the numbered list below) are required?

1. Frame aggregation

2. Short GI

3. 40 MHz channels

4. 2 spatial streams

5. 3 spatial streams

6. Transmit beamforming (TxBF)

A. 1, 2, 3, 4B. 1, 2, 3, 5


C. 1, 2, 3, 4, 6D. 1, 2, 3, 5, 6E. 2, 3, 4F. 2, 3, 5

Correct Answer: F

Section: (none)Explanation


QUESTION 18You are tasked with designing the WLAN to accommodate certain high density areas on your universitycampus where users are highly transient (frequently come and go). With a limited DHCP pool size (subnetmask = 255.255.252.0) for this WLAN subnet, you want to ensure that your DHCP addresses are usedefficiently and are not exhausted, which would prevent new client associations. The DHCP server is aWindows Server 2008 machine. Your design task is to determine the best configuration to allow as manyusers as possible while avoiding WLAN service interruptions and also to use the available addresses asefficiently as possible.

What setting would be most effective at achieving this design task?

A. Set the RTS threshold to 2346 bytesB. Set the inactive wireless client timeout (client age-out) to 5 minutesC. Set the maximum client limit per radio to 64D. Set the DHCP lease for this pool to 20 minutesE. Enable WLAN Controller DHCP relayF. Enable mandatory admission controlG. Set the AES rekey interval to 5 minutesH. Set the 802.1X re-authentication timer to 10 minutes



QUESTION 19What is the DSCP Per Hop Behavior equivalent classification of the 802.11e AC_VO priority level?

A. AF31B. CS3C. VOD. EF


E. AF12



QUESTION 20You are working on a VoWLAN design with your customer's wired networking team. How many distinctpriority levels do you expect for the voice applications?

A. 1 priority level, but 2 queues (one for uplink traffic, one for downlink traffic)B. 1 priority level per client and AP pair, so the total number depends on the expected number of clientsC. 1 priority level for voice RTP, 1 priority level for voice control and RTCPD. 1 priority level for VoWLAN client traffic, 1 priority level for wired VoIP client traffic



QUESTION 21Given: Use the exhibit as a reference. ABC Company has a WLAN controller with 10 controller- based APs;the Voice SSID is configured for centralized data forwarding. Each AP is connected to an access port on alayer-2 Ethernet switch. Each layer-2 switch is uplinked to a single layer-3 core Ethernet switch. The WLANcontroller is connected directly to the layer-3 core Ethernet switch. Layer-3 tunnels are created between allcontroller-based APs and the WLAN controller. A voice server is connected to the layer-3 Ethernet switch.


When a voice-enabled QoS STA sends an IP data packet to a voice server in this scenario, the DSCP

value carried in the STA's IP data packet gets mapped to what and by which device?

A. The DSCP value is mapped to an IEEE 802.1Q priority tag value by the WLAN controller.B. The DSCP value is mapped to the DSCP value in the encapsulating IP header by the layer-3 switch.C. The DSCP value is mapped to an IEEE 802.1p (802.1D-2004) UP value by the access point.D. The DSCP value is mapped to an IEEE 802.1Q VLAN tag by the access point.E. The DSCP value is mapped to the VLAN ID by the layer-2 Ethernet switch.



QUESTION 22Given: For this fill-in the blank question, each answer option contains an answer for the first and secondblanks, separated by a dash "--". Choose the answer option that correctly fills in both blanks in the followingsentence.

A WLAN may use 802.11 admission control to ________, and admission control requirements areconfigured separately for each ________.


A. Block stations with inadequate security parameters -- SSIDB. Identify voice-enabled wireless devices -- AP radio (that is, 2.4 GHz or 5 GHz)C. Regulate the available bandwidth resources -- Access CategoryD. Mark ingress and egress frames with priority values -- TCP/IP portE. Administer VoWiFi use policy -- VLAN



QUESTION 23In a large enterprise (5000+ wireless users), by what recommended methods are IP addresses and VLANsassigned to different clients associated to the same AP? (Choose 3)

A. Each SSID is mapped to a static VLAN assignmentB. Upstream AAA servers dynamically assign VLANs to each user or group profileC. Radio signal metrics (RSSI, SNR, etc.) of WLAN clients are triangulated for location-based VLAN

assignment during associationD. Each BSSID is assigned a unique VLAN to help manage the size of broadcast domains on the wired

networkE. Multiple VLAN pools are designated for an SSID and user IP addresses are selected in a round-robin

fashion from the associated pools.F. In a centralized data forwarding model, clients automatically receive an IP address on the native VLAN

of the AP's Ethernet access port.G. The configuration profile of the client supplicant is hard-coded with a VLAN ID.

Correct Answer: ABESection: (none)Explanation


QUESTION 24In a multiple channel architecture (MCA) network supporting 802.1X authentication, what aspects of WLANdesign affect client roaming efficiency and effectiveness? (Choose 3)

A. Channels supported by infrastructureB. Key caching protocolsC. Cipher suiteD. PHY standard used by clientE. Supported uplink and downlink MCS ratesF. The infrastructure's roaming algorithmG. Channels supported and scanned by client


Correct Answer: ABGSection: (none)Explanation


QUESTION 25An associated STA detects a new BSS with the same SSID as the STA's current BSS. The new BSS usesa different IP subnet than the current BSS. If the STA is configured to use 802.1X/EAP preauthentication,what is likely to occur?

A. The STA will not attempt to preauthenticate because the new BSS uses a different IP subnet.B. The STA will attempt to preauthenticate, but fail because the new BSS uses a different data-link

broadcast domain.C. The STA will attempt to preauthenticate and succeed if DHCP is supported on the new subnet.D. The STA will attempt to preauthenticate and succeed if IP Mobility is enabled on the AP or WLAN

controller.E. The STA will attempt to preauthenticate and succeed if the current AP has shared its cached PMK.



QUESTION 26Given: A WLAN controller is connected to ABC Company's core layer 3 Ethernet switch with an IEEE802.1Q trunk connection. The WLAN controller's native VLAN is VLAN 6 and its IP address is10.0.14.2 /24. Lightweight APs supporting centralized forwarding are connected to the network on VLANs 7,8, and 9, and they each build a layer 3 tunnel back to the WLAN controller's IP address. The dynamicallyassigned IP addresses received by each AP from a DHCP server will be ________________.

A. Associated with the VLAN on which they are connected.B. Associated with the native VLAN of the WLAN controller.C. Associated with VLAN 1, the default VLAN for new APsD. Associated with a non-routable VLAN until the MAC address of the AP is removed from the controller's

MAC filter




QUESTION 27What is the purpose of DHCP Option 43, and how is it used with WLANs?

A. It provides clients with a temporary IP address on a restricted VLAN until 802.1X authentication iscompleted. Then the client receives its long-term IP address.

B. It provides IP address bindings for specific network nodes that require long-term IP addressassignments. WLAN controllers are configured to use Option 43 to receive long-term IP address leasesthat are centrally managed with DHCP.

C. It supports vendor-specific IP address attributes for node discovery purposes. APs use Option 43 withvendor class identifiers to obtain the IP address of a centralized WLAN controller.

D. It integrates a DHCP server with AAA servers and user databases to dynamically assign IP addressesto client devices. During 802.1X, the AAA server uses Option 43 to notify the DHCP server what IP poolthe client's address should be drawn from.



QUESTION 28You deployed an AP and installed its antenna, and you now need to set the AP transmit power. Given adesired EIRP of 21 dBm, and an antenna gain of 5.85 dBd connected through 25 feet of cable with a lossspecification of 4 dB/100 feet. Assuming that there is no significant loss from the connectors, what shouldbe the transmit power level for this AP?

A. 10 mWB. 14 mWC. 20 mWD. 25 mWE. 40 mWF. 50 mW



QUESTION 29The exhibit illustrates the azimuth and elevation for what type of antenna?


A. Omni-directionalB. 20 degree vertical yagiC. 120 degree horizontal sectorD. 60 degree horizontal patchE. 10 degree vertical grid



QUESTION 30What is a radome?

A. A type of semi-circular ceiling found in atriums and that is a heavy cause of RF reflection.B. A weatherproof piece of plastic covering an antenna or antenna system.C. The unit used to measure the signal reflected backward by the end of a cable.D. A piece of metal positioned behind APs mounted on outdoor poles, designed to limit the butterfly effect.E. The unwanted signal coverage provided by either side or back lobes in directional antennas.



QUESTION 31What antenna connector type is displayed in the exhibit?


A. RP-TNCB. RP-SMAC. N ConnectorD. MC ConnectorE. MMCX



QUESTION 32What type of pattern matches the 12 dBi antenna displayed in the exhibit?


A. Figure 1B. Figure 2C. Figure 3D. Figure 4



QUESTION 33What is the purpose of Friis transmission equation [(LdB) = 20 log(d) + 20 log (f) - 27.55 ]?

A. Calculate earth bulge to determine minimum antenna heightB. Calculate receive sensitivity for an 802.11 radio/antenna pair

C. Calculate RF path loss in free space"Pass Any Exam. Any Time." - www.actualtests.com 20CWNA PW0-250 Exam

D. Calculate the loss experienced between the intentional radiator and antennaE. Calculate the minimum voltage requirements for lightning suppression systems



QUESTION 34Why does a frame transmitted at 1 Mbps have a greater usable range than the same frame transmitted at54 Mbps?

A. Free space path loss causes greater signal dispersion for higher rate transmissions.B. Receiver sensitivity requirements are lower for frames transmitted with less complex modulation and

coding.C. To improve reliability, 802.11 STAs increase transmit power as the signaling rate decreases.D. Lower data rate RF transmissions travel at higher speeds and are less likely to experience collisions.E. Frames sent at higher data rates are also sent at higher power levels and are therefore more prone to

collisions and multipath.



QUESTION 35What RF math formula should be used to convert an RF value in units of dBm into a value of mW?

*NotE. "dBm" in the formulas represents the known dBm value

A. mW 10(dBm/10)B. mWC. mWD. mWE. mWF. mW =




QUESTION 36Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive featuresintroduced by 802.11n with MIMO. This exercise allows you to quantify the feature's value in a real-worldenvironment.

What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to

the same AP using only a single antenna for transmit and receive (effectively simulating a 1x1 chip)?

A. 2 Rx or Tx chains = 3 dBi gain3 Rx or Tx chains = approx 5 dBi gain4 Rx or Tx chains = 6 dBi gain

B. 2 Rx or Tx chains = 1 dBi gain3 Rx or Tx chains = 2 dBi gain4 Rx or Tx chains = 3 dBi gain

C. 2 Rx or Tx chains = 3 dBi gain3 Rx or Tx chains = 6 dBi gain4 Rx or Tx chains = 9 dBi gain

D. 2 Rx or Tx chains = approx 4-6.5 dBi gain3 Rx or Tx chains = approx 7-10 dBi gain4 Rx or Tx chains = approx 10-12 dBi gain

E. The theoretical gains offered by each additional radio are different for TxBF and MRC.



QUESTION 37Use the exhibit as a reference.


Given:

- In your regulatory domain, a Tx Power Level of "1" is equivalent to 17 dBm.- For every integer increment (e.g. from 1 to 2) to the Tx Power Level, the AP's transmit power is halved.

In units of mW, what is the actual transmit power for an AP configured at a Tx Power Level of "4"?

A. 200 mWB. 50 mWC. 12.5 mWD. 8 mWE. 6.25 mWF. 2.5 mW

Correct Answer: ESection: (none)

Explanation


QUESTION 38You told your customer that multipath fading may be mitigated simply by moving one or both of thereceiver's antennas a little bit, usually by one to four wavelengths away from its original position. Yourcustomer is prepared to make the change, but does not know the wavelength for 802.11a.

What is the approximate wavelength of an 802.11a radio wave?

A. 5.5 cm (2.16 inches)B. 12 cm (4.72 inches)C. 15.24 cm (6 inches)


D. 45 cm (17.71 inches)E. 58 cm (22.83 inches)



QUESTION 39What is a valid 40 MHz channel configuration in the 2.4 GHz ISM band where channels 1-11 are permitted?(Choose 2)

A. 4 (primary), +1 (secondary)B. 4 (primary), -1 (secondary)C. 8 (primary), +1 (secondary)D. 1 (primary), 6 (secondary)E. 11 (primary), 6 (secondary)F. 1 (primary), 5 (secondary)

Correct Answer: AFSection: (none)Explanation


QUESTION 40Assume that your network operates in a regulatory domain that allows use of UNII-1, UNII-2, UNII- 2e,UNII-3, and the 5.8 GHz ISM band for indoor Wi-Fi. In your upcoming 802.11n deployment, you would liketo take advantage of the performance improvements that result from channel bonding. However, afterextensive testing, you have determined that your mission-critical WLAN should not use channels requiringDFS support.

Given those two criteria (enable channel bonding and disable DFS channels), in the 5 GHz spectrum, howmany non-overlapping channels will your system be able to use?

A. 2B. 3C. 4D. 6E. 11




QUESTION 41Assuming an identical RF environment,

which one of these scenarios is most likely to lead to a client-to-AP link imbalance in which one- waycommunication results?

A. Option AB. Option BC. Option CD. Option D


Explanation/Reference:

Explanation:

QUESTION 42You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminaryWLAN design specifies support for the 5 GHz spectrum, you would like to test for radar pulses to determineif DFS channels should be supported at this facility. As a part of your spectral survey with a laptop-basedanalyzer, you include DFS testing to identify the presence of radar. This is done by manually observingReal-time FFT, Duty Cycle, and Active Devices charts of the spectrum analyzer software.

"Pass Any Exam. Any Time." - www.actualtests.com 25CWNA PW0-250 ExamWhat potential drawback is present with this DFS test method? (Choose 3)

A. Many WLAN products that support DFS channels report several false positives. Ideally, the actualWLAN equipment used in the deployment should be used to test for DFS.

B. Some sources of 5 GHz radar, such as military ships, are mobile in nature. A longer, automated testsetup should be used to identify the presence or absence of radar.

C. Manual identification of radar pulses using spectrum analysis charts can be very difficult due to radar'slow amplitude at the Wi-Fi receiver.

D. Modern spectrum analyzer adapters do not provide the necessary bandwidth resolution required todetect and measure radar signatures.

Correct Answer: ABCSection: (none)Explanation


QUESTION 43When performing an indoor predictive site survey to make the WLAN planning and design cycle moreefficient, what is a best practice for configuration of the simulated APs in the predictive modeling software?

A. All simulated APs should be set to 20 MHz channels only.B. Always use the default 2.2 dBi omnidirectional antenna patterns for simulated APs.C. If dynamic RRM will be used, AP transmit power should be set to an estimated average level of the

expected client devices, such as 25 mW.D. Defining custom AP and antenna patterns will yield more accurate prediction data than the pre-

configured vendor AP/antenna combinations.



QUESTION 44What exhibit reflects the recommended life-cycle steps for successfully designing and deploying anenterprise WLAN from start to finish? (Choose 2)



A. Solution 1B. Solution 2C. Solution 3D. Solution 4E. Solution 5

Correct Answer: AESection: (none)Explanation


QUESTION 45When preparing a floor plan graphic for use in predictive and manual site surveying, what calibrationmethod will lead to the most accurate and reliable RF data?

A. Use the known size of a small object, such as a ceiling tile, and use a single instance of this object (e.g.a single ceiling tile) to scale the floor plan.

B. Measure the width of an actual office doorway with a tape measure and use this value to calibrateagainst a doorway graphic.

C. Use the longest available measurement (like a straight exterior wall) to calibrate the graphic's scale.D. Calibrate the ceiling height of the floor plan first, then the survey software should be able to auto-

calibrate the X and Y planes of the graphic.E. With properly formatted .bmp and .png graphics, the site survey software should be able to extract the

scale directly from the graphic data during import.




QUESTION 46While configuring your site survey software for an upcoming manual survey project, you notice theconfiguration option for "Network Card Simu-lation" as shown in the exhibit.

"Pass Any Exam. Any Time." - www.actualtests.com 29CWNA PW0-250 ExamWhat is the purpose of this feature and when would you use it?

A. This setting allows the site survey software to convert the AP's measured downlink RF data into asimulated data set as if the same data were transmitted by a specific client station. It is useful fordetermining uplink client performance when clients are located far from APs as well as projecting cellsize for ad hoc networks.

B. Since WLAN adapters are not typically calibrated by manufacturers, this setting is a form of softwarecalibration in which you can calibrate an (uncalibrated) adapter to match one of thecalibrated adaptersshown in the list. This process improves the reliability of RF data collection and reporting whenuncalibrated adapters are used.

C. This is the configuration area in which you specify the adapter type that will be used for the site surveyso that the survey software can interpret that adapter's reported metrics (based on proprietary formulas)into an RF measurement that is standardized by the survey software and known to its users. This isdone for every survey.

D. The site survey software manufacturer allows you to view the collected RF data as if it were collected bya different type of adapter. This functionality allows you to review survey data to determine how the RFenvironment will likely look based on the receive sensitivity and other RF capabilities of a specific clientadapter.



QUESTION 47A wireless engineer from your company performed a site survey in an office building where a wirelessnetwork extension was needed. He reports that while performing a Layer 1 sweep near a meeting room fullof people, he detected the RF environment displayed in the exhibit. He is unsure how to interpret what herecorded to determine its impact on a future Wi-Fi network.

"Pass Any Exam. Any Time." - www.actualtests.com 30CWNA PW0-250 ExamWhat is true about this RF environment and its potential impact on the WLAN?

A. The signal affects the entire spectrum and will render the wireless network unusable. It must be locatedand removed.

B. The signal has a low duty cycle and should not be of major impact on the wireless network.C. The signal is alternating between peaks (high interference level) and valleys (low interference level).

The network channel design must be built to avoid the affected peak frequencies.D. The signal is typical of a high radio card background noise. It shows that the card used for the Layer 1

sweep should be replaced and the Layer 1 sweep re-done.E. The Real Time FFT shows a high amplitude, narrowband jammer pulsing across the entire 2.4 GHz

band. This will cause significant, intermittent interference to the WLAN.



QUESTION 48A Layer 1 sweep was performed at a customer location, and you are asked to review a capture takenduring the survey.

What is the meaning of the chart shown in the exhibit and how should it be interpreted?

A. Real Time FFT means Real Time First Fundamental Trace and shows the value of the first signaldetected on each frequency at each sweep interval.

B. Real Time FFT means Real Time Fast Frequency Timing and shows the RF pulses measured by theLayer 1 sweep tool."Pass Any Exam. Any Time." - www.actualtests.com 31CWNA PW0-250 Exam

C. Real Time FFT means Real Time Fast Fourier Transform and shows the max value of the signaldetected on each frequency in real time.

D. Real Time FFT means Real Time Frequency Fundamental Texture and shows the value of the noisebackground generated by the card used to perform the Layer 1 sweep.



QUESTION 49In a PC-based spectrum analyzer, what data chart identifies the overall RF utilization of a specific frequencyin the environment being surveyed?

A. FFT Max HoldB. FFT AverageC. Swept SpectrogramD. Duty cycleE. Sweep TimeF. Bandwidth resolution



QUESTION 50Given: In a site survey deliverable report, you are expected to explain the spectrum measurements taken atthe customer's site. The exhibit shows a representative sample capture of the RF environment at one of thecustomer sites.

"Pass Any Exam. Any Time." - www.actualtests.com 32CWNA PW0-250 ExamWhat best explains the data presented in this exhibit?

A. The Real Time FFT chart shows a high noise floor across the entire 2.4 GHz band.B. Channel 1 is being heavily utilized by Wi-Fi and channel 11 also has some moderate Wi-Fi activity.C. As indicated by the data in the Active Devices list, the spectrum analysis chipset is also reporting 802.11

information.D. Although some access points are present in a nearby area, they are not being heavily used.

Correct Answer: DSection: (none)

Explanation


QUESTION 51You are testing a VoWLAN deployment, and your communication measurements show a certain amount oflost packets. What would be an acceptable packet error rate value to still provide acceptable call quality?

A. There should be 0% error in a VoWLAN type of deploymentB. No more than 1% PER max should be acceptableC. No more than 4% PER max should be acceptableD. No more than 8% PER max should be acceptableE. No more than 12% PER max should be acceptable



QUESTION 52You are site surveying a network for VoWiFi. You have positioned an AP for a manual survey and aremoving away from the AP with a phone in Survey Mode in your hand and you are reading the RSSI value ofthe signal received from the AP. You have previously determined that the noise floor was approximately -94dBm on this floor of the building. The phone's documentation does not specify a recommended RSSI orSNR value for best performance. Based on the information provided and the type of device (VoWiFi phone)you are deploying, what minimum RSSI should you plan for in all areas you are monitoring and whereVoWiFi service is desired?

A. 75 dBmB. 72 dBmC. 67 dBm


D. 62 dBmE. 58 dBm



QUESTION 53What statement is true of a WLAN design that supports Real-Time Location Services (RTLS) with 802.11RFID asset tags? (Choose 2)

A. When passive tags are implemented, the AP density should be increased by 25% to make up for theshorter transmit range of passive tags as compared to active tags.

B. Active RFID tags periodically transmit 802.11 beacon management frames that must be synchronizedwith the AP for proper location of the tagged asset.

C. With passive tags, AP transmit gain should be increased to supply extra power for near-field coupling orbackscatter modulation from the tag to the AP since the passive tag lacks an internal power source.

D. Passive tags do not communicate directly with the WLAN infrastructure, but instead they rely on the taginterrogator to communicate tag information to the infrastructure's location tracking server/database.

E. Active tags transmit directly to the APs and may not require 802.11 authentication and association topass data traffic to the RTLS engine.

F. When tracking assets with passive RFID tags, some APs should be moved, or additional APs be added,to provide more accurate triangulation and location services.

Correct Answer: DESection: (none)Explanation


QUESTION 54At a university, the WLAN has been successfully deployed for ubiquitous access for faculty, students, andguests. Many student computer labs are available throughout the campus with wired network connectivity,but there are also a few smaller lab areas and workstations where Ethernet cabling is not available. Forstudent wireless use, the students must authenticate against RADIUS/Active Directory using PEAP. Also,the network administrators at this university would like administrative access to these workstations whenthey are not in use by students so that the administrators can manage group policies, update OS patches,and perform other routine software maintenance.

What deployment options are available and recommended for both student use and remote

"Pass Any Exam. Any Time." - www.actualtests.com 34CWNA PW0-250 Examadministration of these workstations? (Choose 2)

A. Due to the architecture of 802.1X port-based access control, it is not possible for a wireless- onlycomputer to access network services required by network administrators in this scenario.

B. Machine authentication accounts should be enabled to provide persistent machine network connectivitywhen student users are not associated.

C. The WLAN infrastructure vendor is responsible for providing proprietary client connectivity options tofacilitate device connectivity without user interaction.

D. These workstations should be Ethernet-connected to a wireless client bridge, which will maintainnetwork connectivity independent of student connectivity status.

E. These stations should be deployed with dual WLAN adapters. One adapter would be used forconsistent network connectivity for administrative purposes and the second adapter should be used forstudent access.

Correct Answer: BDSection: (none)Explanation


QUESTION 55What are some advantages of designing guest access as it is shown in the exhibit?


A. Allows a single SSID with different authentication/encryption models to be used for all WLAN servicesfor corporate users and guests

B. Minimizes configuration requirements for segmentation and filtering of guest traffic across internal LANC. The border firewall configuration will not require any additional rules to pass guest traffic to the DMZ

controllerD. Enhances performance of web proxy servers in the DMZ for guest Internet trafficE. Allows simple and secure guest collaboration (file/print sharing) with corporate users



QUESTION 56In this question, you will compare the mobility processes of a network that supports WPA2- Personal andWPA2-Enterprise. Assume the use of a 15-character ASCII passphrase for WPA2- Personal and EAP-TTLS/MSCHAPv2 with WPA2-Enterprise. Also, assume that proprietary roaming protocols are notsupported.

When a device transitions from one BSS to another within the same ESS, what steps must be performed inthe WPA2-Enterprise transition that are not performed in the WPA2-Personal transition? (Choose 2)

A. Open System AuthenticationB. 802.11 ReassociationC. 802.1X authenticationD. 4-Way HandshakeE. Transfer of PMK from AAA server to authenticatorF. Conversion of passphrase to PMK

Correct Answer: CESection: (none)Explanation


QUESTION 57ABC Manufacturing has a heavily-used dual-band (2.4 / 5 GHz) WLAN, but sporadic RF interference acrossthe 2.4 GHz band is causing dropped VoWiFi calls and leading to data connectivity and throughputproblems.


What steps should ABC Manufacturing take to most effectively remedy this problem?

A. Solution 1B. Solution 2C. Solution 3D. Solution 4




QUESTION 58You captured the wireless frame shown in the exhibit during a post-deployment verification site survey.

What can you tell the customer about this network?

A. This is a video stream packet, and there is a QoS marking issue on the wired side, because the DSCPvalue should not be set to 0.

B. This is a voice control packet, and the configuration looks normal, as voice control may or may not havea DSCP tag.

C. This is a video stream packet, and the configuration looks normal, as DSCP is always set to 0 when802.11e QoS is specified at Layer 2.

D. This is a voice RTP packet, and its marking was downgraded from Voice to Video which is a sign ofcongestion issues.



QUESTION 59During a post-deployment verification, you are requested to troubleshoot an area where users areexperiencing poor throughput. They are using data communication only, mainly from laptops. You capturedthe frame displayed in the exhibit from the location where problems are reported. This frame is typical ofthose that were captured by the analyzer.


What does this frame reveal about the RF network in this area?

A. One station seems to be streaming video, thus may have reserved significant bandwidth via admissioncontrol

B. Contention Free is in place in this network, which may starve some non-QoS stations from accessC. Multipath or excessive collisions seem to be an issue in this areaD. The AP seems to be too far to provide enough coverage to this areaE. Stations are using null data frames as protection mechanisms to reserve the medium

F. The station that sent this frame is causing a DoS attack by using extended Duration values



QUESTION 60Excessive uplink RTP frame retransmissions can result in ____________. (Choose 3)

A. Deauthentication of the transmitter by the receiverB. Lowering of the data transmission rate by the transmitting stationC. MOS scores in excess of 5


D. Head-of-Line blocking at the receiverE. Shortened battery life of a transmitting stationF. Increased jitter in a VoWiFi connection

Correct Answer: BEFSection: (none)Explanation


"Pass Any Exam. Any Time." - www.actualtests.com 40


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