2014年2月27日星期四

PW0-250 exam study guide

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Exam Code: PW0-250
Exam Name: CWNP (Certified Wireless Design Professional (CWDP) )
Free One year updates to match real exam scenarios, 100% pass and refund Warranty.
Total Q&A: 60 Questions and Answers
Last Update: 2014-02-27

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NO.1 In a centralized WLAN architecture, what new problem may arise when you change the data forwarding
model from centralized to distributed? (Choose 2)
A. APs that were designed for a centralized forwarding model may not support all features in distributed
forwarding mode.
B. The Ethernet switch ports to which APs are connected may need to be reconfigured to support VLAN
tagging 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 transmit
power arbiter for other APs in the ESS.
D. Centralized control functions, such as key management and distribution, RRM, and load balancing will
no longer be supported.
E. APs will not have the processing capabilities to support AES-CCMP, so TKIP will be the recommended
encryption method.
Answer: A,B

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NO.2 In a manufacturing facility with highly reflective materials, you are planning an upgrade to your existing
802.11b solution. You have chosen a dual-band 802.11n infrastructure product for this purpose. Your
client applications 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 You are evaluating all of the 802.11n
enhancements and determining which features to enable for your environment and applications.
In this scenario, what 802.11n enhancements should NOT be enabled on the 2.4 GHz radio of the new
APs? (Choose 2)
A. 40 MHz channels
B. Short guard intervals
C. Block Acknowledgments
D. Frame aggregation
E. MRC
F. STBC
Answer: A,B

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NO.3 Your customer location is equipped with DAS, originally deployed to relay a GSM signal indoors and
provide 802.11 data coverage to static stations. What type of wireless application would be least likely to
be supported by this RF distribution model?
A. On-demand video streaming over wireless
B. Data connection with frequent roaming
C. Location-based services for wireless assets or RFID tags
D. VoWLAN if the codec is G.729.
E. FTP over implicit TLS/SSL
Answer: C

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NO.4 After surveying for the ideal mounting locations for APs, you have been asked to compromise RF
propagation optimization due to aesthetic concerns raised by your customer. In the end, you ve decided to
mount 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.
Answer: B,C

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NO.5 According 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 SSL
certificate 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 from
rogue authentication servers.
C. The Trusted Root Certification Authorities
list is provided to identify the certificate that the client
should send to the AS for client authentication.
D. The Do not prompt user to authorize new servers or trusted certification authorities
box should be
checked only for administrative users.
E. The Enable Identity Privacy
checkbox and anonymous name field are only useful for networks
supporting EAP-LEAP.
Answer: B

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NO.6 Given: 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 1
B. Figure 2
C. Figure 3
D. Figure 4
E. Figure 5
F. Figure 6
Answer: C

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NO.7 Which 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 the
WLAN controller along with management and monitoring functions.
B. PHY functions are performed directly by the AP. MAC functions are divided almost equally between the
WLAN 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 functions
or 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 network
services with one another and are managed by a WNMS, so no WLAN controller is used in this
architecture.
Answer: A

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NO.8 One of your customers plans on providing wireless coverage to a warehouse facility. After performing an
initial walkthrough, you collect the following information:
-The central part of the warehouse is between 400 and 600 feet (122 to 183 meters) from the warehouse
switches 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, from
electronics and plastic toys to food pallets and juice bottles.
-Workers need basic data coverage from their working location, and are not highly mobile. They usually
work 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)
of the warehouse?
A. Equip workers laptops with a directional antenna and install APs less than 328 feet (100m) away from
the switch.
B. In this case, extend the cable length just beyond 328 feet (100 m) and position APs as close as
possible to 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.
Answer: D

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NO.9 When a WLAN controller transmits an Ethernet frame that has an IEEE 802.11 frame as its payload to a
lightweight AP, what type of QoS marks can be applied to the Ethernet frame and/or its payload? (Choose
3)
A. IEEE 802.1Q PCP marks in the Ethernet frame header
B. User Priority marks in the IEEE 802.11 frame header
C. Throughput subscription marks in the Ethernet frame header
D. MPLS tags from the Label Edge Router (LER)
E. DSCP marks to the ToS bits in the encapsulating IP packet header
F. RSVP tag if RTP is the payload of the IEEE 802.11 frame
Answer: A,B,E

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NO.10 When deploying long-distance 802.11 bridge links (10 miles / 16 km), what parameter may be critical for
improving data flow by reducing retries caused by the long distances.?
A. The sequence control field value
B. The acknowledgement timeout threshold
C. The minimum transmit data rate value
D. The CTS-to-self threshold
E. The Beacon interval
F. The PHY parameter set field
Answer: B

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