Ensurepass

QUESTION 21

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?

 

A.

153

B.

144

C.

161

D.

56

E.

48

 

Correct Answer: B

 

 

QUESTION 22

You are selecting antennas for a WLAN operating in the 5 GHz frequency band. What specifications should be evaluated for an antenna before it is implemented in this WLAN system? (Choose 3)

 

A.

802.11ad compatibility

B.

TPC support

C.

Impedance in Ohms

D.

Elevation Beamwidth

E.

Return Loss Rating

F.

Operating Frequencies

 

Correct Answer: CDF

 

 

QUESTION 23

What is the intended use for the WLAN hardware known as a pole or mast mount unit?

 

A.

Mounting a lightning arrestor to a grounding rod

B.

Mounting an omnidirectional antenna to a mast

C.

Mounting an RF amplifier to a dipole antenna

D.

Mounting a PoE injector to a perforated radome

E.

Mounting an access point to a site survey tripod

 

Correct Answer: B

 

 

QUESTION 24

XYZ Corporation is experiencing connectivity problems with their existing building-to-building bridge link. A concrete wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many frames. The administrator moves the antenna to an area not obstructed by the concrete wall and then realizes the RF cable cannot reach the new location. If an extension cable is added to move the antenna, what are the likely results?

 

A.

The data throughput rate will increase because VSWR will decrease.

B.

The Equivalent Isotropically Radiated Power (EIRP) will decrease.

C.

The antenna’s azimuth beamwidth will decrease.

D.

The size of the Fresnel zone will increase.

E.

The likelihood of a direct lightning strike will increase.

Correct Answer: B

 

 

QUESTION 25

When using an RF splitter to connect one transceiver to sector antennas loss is incurred. What is this loss called?

 

A.

Conversion loss

B.

Through loss

C.

Active loss

D.

Intentional loss

 

Correct Answer: B

 

 

QUESTION 26

What statements accurately describe the RF cables and connectors that are used in an 802.11 WLAN system? (Choose 3)

 

A.

RF cables have upper and lower frequency range specifications.

B.

75 and 125 ohms are the typical impedances of 802.11 WLAN connectors.

C.

Two RF connectors of the same type (e.g. SMA), manufactured by different companies, may vary in specifications.

D.

Every RF connector causes insertion loss.

E.

Large diameter RF cables cause greater loss than small diameter cables.

 

Correct Answer: ACD

 

 

QUESTION 27

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

 

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.

 

Correct Answer: D

 

 

QUESTION 28

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?

 

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.

 

Correct Answer: C

 

 

QUESTION 29

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

 

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)

 

Correct Answer: CD

 

 

QUESTION 30

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)

 

A.

HT

B.

OFDM

C.

HR/DSSS

D.

ERP-PBCC

E.

DSSS-OFDM

 

Correct Answer: AB

 

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