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QUESTION NO: 2

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

Explanation:

QUESTION NO: 10

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

Explanation:

QUESTION NO: 9

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

Explanation:

QUESTION NO: 4

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

Explanation:

QUESTION NO: 7

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

Explanation:

QUESTION NO: 8

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

Explanation:

QUESTION NO: 6

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

Explanation:

QUESTION NO: 11

Multicast video applications typically require special treatment on the Wi-Fi network due to the

nature of multicast 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.

Answer: C

Explanation:

QUESTION NO: 13

As you plan a WLAN upgrade, you have assessed the network requirements and data signatures

of your applications. One of the popular applications used on your network requires high

bandwidth and low to medium Wi-Fi loss, but can tolerate moderate latency and jitter.

What application matches this description?

A. Voice

B. Email

C. Skype chat

D. Video-on-demand

E. Video conferencing

F. FTP

Answer: D

Explanation:

QUESTION NO: 5

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

Explanation:

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