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CWNA-106 Certified Wireless Network Administrator Questions and Answers

Questions 4

As a station moves away from the access point to which it is associated, it changes its data rate from 600 Mbps to 540 Mbps and then to 450 Mbps.

What IEEE 802.11 term is used to describe this functionality?

Options:

A.

Dynamic Rate Switching

B.

Multirate Control

C.

Modulation and Coding Selection

D.

Rate Set Selectivity

E.

Adaptive Rate Management

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Questions 5

What statement about 802.3-2012, Clause 33 Power over Ethernet is true?

Options:

A.

Up to 30 watts of power may be provided through an Ethernet cable.

B.

By using CAT3 cabling, you can increase the maximum draw available to the PD.

C.

When using CAT5 cabling, you decrease the maximum draw available to the PD.

D.

Only endpoint PSEs are supported.

E.

Only midspan PSEs are supported.

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Questions 6

What can cause an excessively high VSWR (Voltage Standing Wave Ratio) in a WLAN RF transmission line?

Options:

A.

An impedance mismatch in the RF cables and connectors

B.

Reflected direct current (DC) voltage on the main RF signal line

C.

Attenuation of the RF signal as it travels along the main signal path

D.

Crosstalk (inductance) between adjacent RF conductors

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Questions 7

Prior to association, what parameter can 802.11 client devices measure and use to select the optimal access point for association?

Options:

A.

Signal strength of access point beacons received

B.

Proximity to potential access points

C.

Retry rate of probe request and response frames

D.

Average round trip time to reach the Internet DNS server

E.

Average round trip time to reach the IP router

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Questions 8

ABC Company has just purchased a 6 dBi patch antenna. After performing some tests with the 6 dBi antenna, they have concluded that more antenna gain is needed to cover their outdoor courtyard. When choosing an antenna with higher gain, what other antenna characteristic will also always change?

Options:

A.

Fresnel Zone size

B.

Maximum input power

C.

Beamwidth

D.

Impedance

E.

VSWR Ratio

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Questions 9

Users and Network support personnel at a mid-sized equipment manufacturer have been discussing the potential uses and benefits of implementing an indoor WLAN. The network administrator and network manager have requested a meeting of senior management personnel to discuss a WLAN implementation before performing a site survey or taking any implementation steps. The first topic of discussion in the meeting is the corporate policy concerning implementation and use of WLAN technology.

What specific topics are appropriate in this policy meeting? (Choose 2)

Options:

A.

Use of the latest 802.11ac equipment

B.

Business justification

C.

User productivity impact

D.

Antenna types

E.

Defining RF channels for use

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Questions 10

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.

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Questions 11

You are an independent contractor, hired to perform an indoor site survey and network design for Luxury Full Service Hotels International. The network will support hotel staff and guest users. You are interviewing the network manager to determine business, performance, and security requirements for the future 802.11 WLAN.

What questions should you ask the IT manager? (Choose 2)

Options:

A.

What data cabling is currently installed in the rooms and throughout the hotel?

B.

How much RF loss do you expect between hotel rooms?

C.

Who installed your existing wired network?

D.

What types of applications will be used by the hotel staff?

E.

On what frequency do the microwave ovens operate in the hotel suites?

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Questions 12

Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive modeling software for surveying, but the company insists on a pre-deployment site visit.

What tasks should be performed as part of the pre-deployment visit to prepare for a predictive survey? (Choose 2)

Options:

A.

With a spectrum analyzer, identify the type, amplitude, and location of RF interference sources, if any are present.

B.

Evaluate the building materials at ABC’s facility and confirm that the floor plan documents are consistent with the actual building.

C.

Test several antenna types connected to the intended APs for use in the eventual deployment.

D.

Collect information about the company’s security requirements and the current configuration of their RADIUS and user database servers.

E.

Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls.

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Questions 13

As a consultant, you’ve been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability. What information should be considered to help them choose the right WLAN client devices?

Options:

A.

802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a

B.

In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies

C.

802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.

D.

802.11ac is not backwardly compatible with 802.11n or 802.11a.

E.

When HR/DSSS devices are present, VHT MCS rates are disabled for the entire BSS.

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Questions 14

What phrase correctly completes the following sentence?

When using WMM Power Save operation, a wireless client device ______________.

Options:

A.

Alternates between awake and dozing, depending on its need to transmit and receive information

B.

Enters a low-power radio state until it receives a WMM PS-Poll frame from the AP

C.

Experiences higher throughput and lower latency than when operating in Active mode

D.

Powers down a subset of MIMO radio chains and transmits information at a slower data rate

E.

Buffers frames destined to the low-power AP until the AP wakes its radio and begins beaconing again

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Questions 15

Which features are incorporated in the 802.11-2012 specification and are recommend for robust WLAN client security? (Choose 2)

Options:

A.

SSID hiding

B.

CAPWAP with DTLS

C.

802.1X/EAP

D.

CCMP cipher suite

E.

IPSec VPN

F.

MAC address white lists

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Questions 16

What HT technology requires MIMO support on both the transmitter and receiver?

Options:

A.

Spatial multiplexing

B.

Short guard intervals

C.

Maximal ratio combining

D.

Orthogonal Frequency Division Multiplexing

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Questions 17

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.

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Questions 18

Why is it recommended for a wireless network administrator to disable 1 Mbps and 2 Mbps data rates on the WLAN infrastructure? (Choose 2)

Options:

A.

To improve capacity in the BSS

B.

To reduce the size of the AP’s effective service area

C.

To prevent 802.11b devices from associating

D.

To maximize the range of the highest data rates

E.

To prevent VoWiFi multicast frames

F.

To enable support for long preambles

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Exam Code: CWNA-106
Exam Name: Certified Wireless Network Administrator
Last Update: Nov 21, 2024
Questions: 138

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