Get CWNA-109 Products Practice Material for CWNA-109 Exam Question Preparation [Q65-Q81]

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Get CWNA-109 Products Practice Material for CWNA-109 Exam Question Preparation

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CWNP CWNA-109 Exam Syllabus Topics:

Topic	Details
Topic 1	WLAN Protocols and Devices: It focuses on terminology related to the 802.11 MAC and PHY, the purpose of the three main 802.11 frame types, MAC frame format, and 802.11 channel access methods.
Topic 2	RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.
Topic 3	WLAN Regulations and Standards: The topic discusses the roles of WLAN and networking industry organizations. It also addresses the concepts of various Physical Layer (PHY) solutions, spread spectrum technologies, and 802.11 WLAN functional concepts.
Topic 4	WLAN Network Security: It addresses the concepts of weak security options, security mechanisms for enterprise WLANs, and security options and tools used in wireless networks.

Q65. What best describes WPA2 in relation to 802.11 wireless networks?

WPA2 is the standard that defines security for WLANs.

WPA2 is a certification created by the Wi-Fi Alliance that validates devices correctly implement CCMP/ AES.

WPA2 is the second version of WPA and it enhances security through the use of TKIP instead of WEP.

WPA2 is specified in the 802.11 standard as implementing CCMP/AES.

Q66. A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?

26 dBm

13 dBm

23 dBm

10 dBm

Q67. An RF signal sometimes bends as it passes through some material other than free space. What is the term that describes this behavior?

Reflection

Refraction

Scattering

Warping

Q68. What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.

OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.

OFDM modulation is used only in 5 GHz 802.11 transmissions.

OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.

Q69. Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?

Laptop-based spectrum analyzers

AP-based spectrum analysis

Overlay WLAN monitoring solution

Laptop-based protocol analyzers

Q70. 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?

2.427

2.422

2.413

2.417

Q71. You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

Channel 6, because it is always best to use this channel

A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision

Channel 1, because it is best to use the channel with the lowest frequency

Channel 11, because channels 1 and 6 are in use nearby

Q72. What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Signal strength of AP beacons received.

PING latency when testing against an Internet server.

Throughput speed in Mbps.

FCS errors in frames transmitted to and from the AP.

Q73. What can cause excessive VSWR in RF cables used to connect a radio to an antenna?

High gain yagi antenna

Radio output power above 100 mW but below 400 mw

High gain parabolic dish antenna

Impedance mismatch

Q74. You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?

OKC

Load balancing

Band steering

Q75. You are using a site survey tool for post-implementation validation. You have installed the appropriate adapter driver and imported a floor plan. Now, you want to take the next step in proper tool use. What must you do before gathering survey data after the floor plan is imported?

Calibrate the floor plan

Install WinPCAP

Nothing, you can simply start capturing signal readings

Install iPerf

Q76. What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?

DMG

SIG

DSSS

TVHT

Q77. A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?

MSK

WEP key

Passphrase

PSK

Q78. You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme. What do you tell the customer?

The clients that must support OFDMA must also be upgraded to 802.11ax

OFDMA is an optional feature of 802.11ax and most APs don’t even support it

All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz

If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades

Q79. When a STA has authenticated to an AP (AP-1), but still maintains a connection with another AP (AP-2), what is the state of the STA on AP-1?

Transitional

Unauthenticated and Unassociated

Authenticated and Unassociated

Authenticated and Associated

Q80. You are deploying a WLAN monitoring solution that utilizes distributed sensor devices. Where should sensors be deployed for best results? Choose the single best answer.

In switching closets

Every 5 meters and alongside each AP

In critical areas where WLAN performance must be high

Above the plenum on each floor

Sensors should be deployed in critical areas where WLAN performance must be high for best results when using a WLAN monitoring solution that utilizes distributed sensor devices. A WLAN monitoring solution is a system that collects, analyzes, and reports on the status and performance of a WLAN. A WLAN monitoring solution can use different methods to gather data from the WLAN, such as embedded software agents, external hardware probes, or distributed sensor devices. Distributed sensor devices are dedicated devices that are deployed throughout the WLAN coverage area to monitor the wireless traffic and environment. Distributed sensor devices can perform various functions, such as scanning the spectrum, capturing wireless frames, measuring signal quality, detecting rogue access points, testing connectivity, and generating alerts. Distributed sensor devices can provide more accurate and comprehensive data than other methods, but they also require more planning and deployment costs. Therefore, it is important to deploy sensors strategically in critical areas where WLAN performance must be high, such as high-density zones, high-priority applications, or high-security locations. By deploying sensors in critical areas, the WLAN monitoring solution can ensure optimal WLAN performance and reliability in those areas and identify and resolve any issues or problems that may arise. The other options are not the best places to deploy sensors for best results. Deploying sensors in switching closets is not effective because sensors need to be close to the wireless medium to monitor it properly. Deploying sensors every 5 meters and alongside each AP is not efficient because sensors may overlap or interfere with each other and cause unnecessary redundancy or complexity. Deploying sensors above the plenum oneach floor is not practical because sensors may not capture the wireless traffic and environment accurately due to attenuation or reflection from the ceiling materials or objects. References: CWNA-109 Study Guide, Chapter 14: Troubleshooting Wireless LANs, page 4831

Q81. XYZ Company has decided to install an 802.11 WLAN system that will support 1083 wireless users, but they are concerned about network security. XYZ is interested in deploying standardized security features. In addition to WPA2-Enterprise with PEAP and role-based access control, XYZ would like to support management frame protection as well as a fast secure roaming protocol for future mobile handsets.
As XYZ Company selects a product to deploy, what two IEEE amendments, which are included in
802.11-2016, and 802.11-2020 should be supported to provide the management frame protection and fast secure roaming security features?

802.11j and 802.11z

802.11r and 802.11w

802.11j and 802.11k

802.11k and 802.11v