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CWNP CWNA-106 Dumps

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Total 138 questions

Certified Wireless Network Administrator Questions and Answers

Question 1

The IEEE 802.11-2012 standard requires VHT capable devices to be backward compatible with devices using which other 802.11 physical layer specifications (PHYs)? (Choose 2)

Options:

A.

HT

B.

OFDM

C.

HR/DSSS

D.

ERP-PBCC

E.

DSSS-OFDM

Question 2

What word describes the bending of an RF signal as it passes through a medium of a varying density from that of free space?

Options:

A.

Diffraction

B.

Reflection

C.

Refraction

D.

Diffusion

E.

Scattering

Question 3

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

Question 4

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.

Question 5

What statement describes the authorization component of a AAA implementation?

Options:

A.

Verifying that a user is who he says he is

B.

Validating client device credentials against a database

C.

Logging the details of user network behavior in order to review it at a later time

D.

Granting access to specific network services according to a user profile

E.

Implementing a WIPS as a full-time monitoring solution to enforce policies

Question 6

What factors influence the distance that an RF signal can be effectively received? (Choose 3)

Options:

A.

Transmitting station’s power source

B.

Receiving station’s radio sensitivity

C.

Free Space Path Loss

D.

MAC layer encryption

E.

Transmitting station’s output power

F.

Temperature in the Fresnel zone

Question 7

What statements about the beamwidth of an RF antenna are true? (Choose 2)

Options:

A.

The lower the gain of an antenna, the more narrow one or both beamwidths become.

B.

The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.

C.

Horizontal and vertical beamwidth are calculated at the points in which the main lobe decreases power by 3 dB.

D.

Horizontal beamwidth is displayed (in degrees) on the antenna’s Azimuth Chart.

Question 8

A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss.

If the cable is connected to an antenna with 10 dBi gain, what is the EIRP at the antenna element?

Options:

A.

10 dBm

B.

13 dBm

C.

20 dBm

D.

26 dBm

E.

30 dBm

Question 9

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?

Question 10

Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility of both OFDM and HR/DSSS? (Choose 2)

Options:

A.

HR/DSSS (802.11b)

B.

OFDM (802.11a)

C.

ERP (802.11g)

D.

HT (802.11n)

E.

CCK (802.11b)

F.

VHT (802.11ac)

Question 11

What is a common feature of an 802.11 WLAN client utility? (Choose 2)

Options:

A.

Real-time retry monitor

B.

AP Signal strength meter

C.

Spectrum analyzer utility

D.

VLAN configuration

E.

Link statistics display

Question 12

Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.

What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?

Options:

A.

A Voltage Standing Wave Ratio (VSWR) of 1:1

B.

An impedance mismatch between components in the RF system

C.

Cross-polarization of the RF signal as it passes through the RF system

D.

The use of cables longer than one meter in the RF system

E.

High output power at the transmitter and use of a low-gain antenna

Question 13

In addition to throughput enhancements, what other improvements does a dual-band 802.11ac AP provide when compared with 802.11a/g APs? (Choose 2)

Options:

A.

Introduces “fast transition” roaming protocols for VoWiFi phones

B.

Better link reliability between 802.11a/b/g client devices and 802.11ac APs

C.

Improves service quality for real-time applications at greater distances

D.

Increases in receive sensitivity enhance RTLS location accuracy

E.

Stronger security with more robust encryption modes.

Question 14

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.

Question 15

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

Options:

A.

802.11a and 11n use six (6) “pilot” subcarriers as a reference for the receiver to detect frequency and phase shifts of the signal.

B.

802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.

C.

With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding rates.

D.

802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantly over 64-QAM available in HT-OFDM.

E.

In 802.11a OFDM, fifty-six (56) subcarriers are used as parallel symbol transmission paths to carry data.

Question 16

The IEEE 802.11a/n/ac physical layer technologies utilize the 5 GHz frequency band. What is true of the channels in this frequency spectrum?

Options:

A.

14 channels are available worldwide.

B.

11 channels are available worldwide.

C.

Regulatory domains worldwide require DFS and TPC in all these channels.

D.

DFS may be required in some regulatory domains on some channels.

E.

802.11 channels are separated by 5 Mhz

Question 17

What statement about 802.11 WLAN performance is true?

Options:

A.

Use of larger frame sizes results in greater throughput in low interference environments.

B.

BSS support for 65 KB A-MPDUs will increase the maximum data rate available to client devices.

C.

In 802.11ac, changing the security mechanism from WPA2-Personal to WPA2-Enterprise will enable the VHT MCS rates.

D.

Compared to an Independent BSS, an Infrastructure BSS can provide almost twice the throughput between wireless nodes.

E.

Use of short guard intervals improves reliability and throughput in high multipath environments

Question 18

In a long-distance RF link, what statement about Fade Margin is true?

Options:

A.

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.

B.

The Fade Margin of a long-distance radio link should be equivalent to the receiver’s antenna gain.

C.

A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.

D.

The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.

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Total 138 questions