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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:

QUESTION NO: 12

Given: 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 implementations

B. Push-to-Talk VoWiFi phones

C. VoWiFi soft phones

D. FMC phones

E. Flat (non-VLAN) VoWiFi implementations

Answer: B

Explanation:

QUESTION NO: 19

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

A. AF31

B. CS3

C. VO

D. EF

E. AF12

Answer: D

Explanation:

QUESTION NO: 17

To 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, 4

B. 1, 2, 3, 5

C. 1, 2, 3, 4, 6

D. 1, 2, 3, 5, 6

E. 2, 3, 4

F. 2, 3, 5

Answer: F

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: 14

Given: The 802.11n APs you have selected for your public access deployment support many of

the PHY and MAC enhancements offered by the 802.11n standard. The AP is single-band (2.4

GHz) and only allows 20 MHz channels. The WLAN radio in the AP is a 3×3 802.11n chip that

supports two spatial streams.

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

A. 54 Mbps

B. 65 Mbps

C. 108 Mbps

D. 144 Mbps

E. 150 Mbps

F. 300 Mbps

Answer: D

Explanation:

QUESTION NO: 1

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

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: 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: 15

As an implementation engineer, you have just received initial design specs from a network

designer for your dual-band 802.11n deployment. The network design documents prescribe the

following data rate configuration 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

802.11b clients 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.

Answer: C

Explanation:

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