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CWNA-106 Practice Exam Questions and Answers

Certified Wireless Network Administrator

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Total Questions : 120

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Question # 1

The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).

What is the center frequency of channel 4?

Options:

A.  

2.413 GHz

B.  

2.417 GHz

C.  

2.422 GHz

D.  

2.427 GHz

E.  

2.437 GHz

Discussion 0
Question # 2

AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of spatial streams that can be used for a downlink HT-OFDM transmission from AP-1 to STA-3?

Options:

A.  

One spatial stream, because the definition of the AP indicates that it is capable of only one spatial stream.

B.  

Three spatial streams, because the definition of the client indicates that it is capable of only three spatial streams.

C.  

Two spatial streams, because the definition of the AP indicates that it is capable of only two spatial streams.

D.  

Three spatial streams, because the definition of the AP indicates that it is capable of only three spatial streams.

Discussion 0
Question # 3

How is throughput capacity scaled in a single channel architecture (SCA) WLAN system?

Options:

A.  

By increasing transmit power and placing APs that are on a single channel farther from one another.

B.  

By adding more SSIDs to existing APs to spread users across different contention domains.

C.  

By adding non-overlapping channel layers through the addition of more APs.

D.  

By using downlink data compression and uplink flow control at the AP.

E.  

By using a single 802.11n radio to transmit simultaneous downlink data streams to different users.

Discussion 0
Question # 4

For what likely reasons might an organization choose to purchase an AP designed for outdoor deployment to use as an indoor WLAN AP at an industrial facility? (Choose 2)

Options:

A.  

Aesthetic requirements

B.  

Physical security and theft prevention

C.  

Protection from environmental conditions

D.  

Reduce transient RF interference

E.  

802.11 security compliance

Discussion 0
Question # 5

ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the regulatory domain and APs use DFS channels as long as radar is not detected. Band steering is also enabled to encourage dual-band clients to use frequency bands with more capacity.

Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios enabled with transmit power adjusted to accommodate relatively similar cell sizes.

This “band hopping” behavior is viewed by network staff to be undesirable. What is the most likely cause of the unpredictable client band selection behavior?

Options:

A.  

Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36-48.

B.  

5 GHz frequencies offer better RF penetration than 2.4 GHz, but 2.4 GHz offers more voice call capacity and lower latency than 5 GHz.

C.  

The voice client does not support DFS, and therefore experiences some 5 GHz coverage holes as it moves through the network.

D.  

The client’s band selection algorithm prefers 5 GHz, but band steering behavior usually steers 75-85% of client devices to 2.4 GHz.

Discussion 0
Question # 6

As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area. What term describes the rate at which this expansion happens?

Options:

A.  

MU-MIMO

B.  

Inverse square law

C.  

Path spread phenomenon

D.  

Fresnel zone thinning

E.  

Ohm’s law

Discussion 0
Question # 7

The 802.11 protocol specifies a fundamental channel access method that is required for all stations and is used in all IBSS and BSS networks.

What is this fundamental channel access method called?

Options:

A.  

DCF

B.  

PCF

C.  

HCF

D.  

EDCAF

E.  

HCCA

F.  

PCF/CA

Discussion 0
Question # 8

You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11ac amendment to the 802.11-2012 standard, which was not available in the standard before this amendment?

Options:

A.  

153

B.  

144

C.  

161

D.  

56

E.  

48

Discussion 0
Question # 9

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)

Options:

A.  

Data frames too large for the physical environment

B.  

Client stations broadcasting with too much power

C.  

Access points broadcasting with too little power

D.  

Client stations too close in proximity to each other

E.  

Obstacles between client stations causing attenuation

F.  

Large 802.11 cells with physically distributed stations

Discussion 0
Question # 10

As a consultant, you have been hired by ABC Company to implement an outdoor WLAN connection between two buildings that are 2 kilometers (1.24 miles) from each other, with no obstructions in between.

Your first required objective is to create a point-to-point link between the two buildings within the local regulatory body’s 800 mW EIRP maximum.

Your second required objective is to provide an industry-standard security solution capable of supporting mutual authentication.

As an optional objective, you must minimize the amount of interference from, and to, nearby WLAN networks.

You install an OFDM wireless bridge at each building, configuring one in root mode and the other in non-root mode. You set each radio for 100 mW (20 dBm) and attach 9 dBi omni-directional antennas to both. You configure the network for WPA2-Enterprise with PEAPv0/EAP-MSCHAPv2 authentication.

Which statement is true about the solution you chose to deploy?

Options:

A.  

Your solution meets both required objectives and the optional objective.

B.  

Your solution meets the first required objective and the optional objective, but not the second objective.

C.  

Your solution meets the second required objective and the optional objective, but not the first required objective.

D.  

Your solution meets neither required objective but meets the optional objective.

E.  

Your solution meets both required objectives, but does not meet the optional objective.

F.  

Your solution does not meet either required objective, or the optional objective.

Discussion 0
Question # 11

What statements about the SSID are true? (Choose 2)

Options:

A.  

The SSID is a security session identifier used in RSNs.

B.  

The SSID must be included in an association request frame.

C.  

The SSID is an alphanumeric value assigned to device manufacturers by the IEE

E.  

D.  

The SSID is a pseudo-random number assigned to each client by an AP.

E.  

The SSID is an alphanumeric value with a maximum length of 32 octets.

F.  

When configuring a new network, creating an SSID is optional.

Discussion 0
Question # 12

A Wi-Fi Alliance interoperability certificate indicates that a device is a/b/g/n certified. It further indicates one transmit and receive spatial stream for both the 2.4 GHz and 5.0 GHz bands. It further indicates support for both WPA and WPA2 Enterprise and Personal. Finally, it indicates support for EAP-TLS, EAP-TTLS/MSCHAPv2, PEAPv0/EAP-MSCHAPv2 and PEAPv1/EAP-GT

C.  

Which one of the following statements is false?

Options:

A.  

This client device supports protection mechanisms such as RTS/CTS and/or CTS-to-Self.

B.  

This client device supports both TKIP and CCMP cipher suites.

C.  

300 Mbps is the maximum supported data rate for this device.

D.  

This client device supports the ERP, OFDM, and HT physical layer specifications.

E.  

This client device supports X.509 certificates for EAP authentication.

Discussion 0
Question # 13

What statement about the IEEE 802.11e QoS facility is true?

Options:

A.  

802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.

B.  

Four 802.1p user priorities are mapped to eight 802.11 transmit queues.

C.  

When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.

D.  

To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.

E.  

802.11 control frames are assigned to the 802.11 EF priority queue.

Discussion 0
Question # 14

In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latency-sensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?

Options:

A.  

The current AP is using channel 1 and the new AP is using channel 40.

B.  

The SSID of the current AP does not match the SSID of the new AP.

C.  

The current AP supports only HT and the new AP is VHT capable.

D.  

The access points are hiding the SSID in Beacons and Probe Response frames.

Discussion 0
Question # 15

What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS? (Choose 2)

Options:

A.  

The number of client stations associated to the BSS

B.  

The power management settings in the access point’s beacons

C.  

The presence of co-located (10m away) access points on non-overlapping channels

D.  

The data rates at which nearby client stations are transmitting and receiving data

E.  

The layer 3 protocol used by each station to transmit data over the wireless link

Discussion 0
Question # 16

What are two channel modes specified by the 802.11n (High Throughput) PHY? (Choose 2)

Options:

A.  

20 MHz

B.  

20/40 MHz

C.  

40/80 MHz

D.  

22 MHz

E.  

80 MHz

F.  

160 MHz

Discussion 0
Question # 17

What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?

Options:

A.  

Military radar

B.  

Properly configured AP

C.  

Microwave oven

D.  

Wireless video camera

E.  

WIPS sensor

Discussion 0
Question # 18

ABC Company has thousands of Wi-Fi users accessing their network on a daily basis. Their WLAN consists of 700 access points, 6 WLAN controllers, and a wireless network management system.

What network functions are performed by the enterprise-class WNMS? (Choose 3)

Options:

A.  

RF pre-deployment planning and post-deployment reporting of access point locations on a floor plan

B.  

Performance and security monitoring of WLAN controllers with alarms and notifications for administrative staff

C.  

Radio management, fast roaming, key caching, and other centralized control plane operations

D.  

Centralized bridging of guest data traffic and application of firewall and QoS policies to data

E.  

Management of WLAN controller configuration and provisioning of firmware updates

F.  

Generating, encrypting, and decrypting 802.11 frames and collecting RF radio data.

Discussion 0
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