CWNA-106 Practice Test

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.

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.

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.

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)

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