CWNA UPDATED ACTUAL Exam
Questions and CORRECT Answers
At which layers of the OSI model does 802.11 technology operate? - CORRECT
ANSWER - Data Link
and
Physical
Which Wi-Fi Alliance certification defines the mechanism for conserving battery life that is
critical for handheld devices such as bar code scanners and VoWiFi phones?
A. WPA2-Enterprise
B. WPA2-Personal
C. WMM-PS
D. WMM-SA
E. CWG-RF - CORRECT ANSWER - WMM-PS
Which of these terms can best be used to compare the relationship between two radio waves that
share the same frequency?
A. Multipath
B. Multiplexing
C. Phase
D. Spread spectrum - CORRECT ANSWER - Phase
A bridge transmits at 10 mW. The cable to the antenna produces a loss of 3 dB, and the antenna
produces a gain of 20 dBi. What is the EIRP?
A. 25 mW
B. 27 mW
C. 4 mW
D. 1,300 mW
,E. 500 mW - CORRECT ANSWER - 500 mW
10/2=5
5x10x10=500
dBi is an expression of what type of measurement?
A. Access point gain
B. Received power
C. Transmitted power
D. Antenna gain
E. Effective output - CORRECT ANSWER - Antenna gain
What are some possible effects of voltage standing wave ratio (VSWR)? (Choose all that apply.)
A. Increased amplitude
B. Decreased signal strength
C. Transmitter failure
D. Erratic amplitude
E. Out-of-phase signals - CORRECT ANSWER - Decreased signal strength
Transmitter failure
Erratic amplitude
When installing a higher-gain omnidirectional antenna, which of the following occurs? (Choose
two.)
A. The horizontal coverage increases.
B. The horizontal coverage decreases.
C. The vertical coverage increases.
D. The vertical coverage decreases. - CORRECT ANSWER - The horizontal coverage
increases.
,and
The vertical coverage decreases.
802.11ac VHT radios are backward compatible with which IEEE 802.11 radios?
A. 802.11 legacy (FHSS) radios
B. 802.11g (ERP) radios
C. 802.11 legacy (DSSS) radios
D. 802.11b (HR-DSSS) radios
E. 802.11a (OFDM) radios
F. 2.4 GHz 802.11n (HT) radios
G. 5 GHz 802.11n (HT) radios
H. None of the above - CORRECT ANSWER - 802.11a (OFDM) radios
and
5 GHz 802.11n (HT) radios
Which IEEE 802.11 amendment specifies the use of up to eight spatial streams of modulated
data bits?
A. IEEE 802.11n
B. IEEE 802.11g
C. IEEE 802.11ac
D. IEEE 802.11s
E. IEEE 802.11w - CORRECT ANSWER - IEEE 802.11ac
Which of the following measures the difference between the power of the primary RF signal
compared against the sum of the power of the RF interference and background noise?
A. Noise ratio
B. SNR
C. SINR
D. BER
, E. DFS - CORRECT ANSWER - SINR
Signal-to-interference-plus-noise (SINR)
What signal characteristics are common in spread spectrum and OFDM-based signaling
methods? (Choose two.)
A. Narrow bandwidth
B. Low power
C. High power
D. Wide bandwidth - CORRECT ANSWER - Low power
and
Wide bandwidth
A service set identifier is often synonymous with which of the following?
A. IBSS
B. ESSID
C. BSSID
D. BSS - CORRECT ANSWER - ESSID
Which CSMA/CA conditions must be met before an 802.11 radio can transmit? (Choose all that
apply.)
A. The NAV timer must be equal to zero.
B. The random back off timer must have expired.
C. The CCA must be idle.
D. The proper interframe space must have occurred.
E. The access point must be in PCF mode. - CORRECT ANSWER - The NAV timer must
be equal to zero.
The random back off timer must have expired.
Questions and CORRECT Answers
At which layers of the OSI model does 802.11 technology operate? - CORRECT
ANSWER - Data Link
and
Physical
Which Wi-Fi Alliance certification defines the mechanism for conserving battery life that is
critical for handheld devices such as bar code scanners and VoWiFi phones?
A. WPA2-Enterprise
B. WPA2-Personal
C. WMM-PS
D. WMM-SA
E. CWG-RF - CORRECT ANSWER - WMM-PS
Which of these terms can best be used to compare the relationship between two radio waves that
share the same frequency?
A. Multipath
B. Multiplexing
C. Phase
D. Spread spectrum - CORRECT ANSWER - Phase
A bridge transmits at 10 mW. The cable to the antenna produces a loss of 3 dB, and the antenna
produces a gain of 20 dBi. What is the EIRP?
A. 25 mW
B. 27 mW
C. 4 mW
D. 1,300 mW
,E. 500 mW - CORRECT ANSWER - 500 mW
10/2=5
5x10x10=500
dBi is an expression of what type of measurement?
A. Access point gain
B. Received power
C. Transmitted power
D. Antenna gain
E. Effective output - CORRECT ANSWER - Antenna gain
What are some possible effects of voltage standing wave ratio (VSWR)? (Choose all that apply.)
A. Increased amplitude
B. Decreased signal strength
C. Transmitter failure
D. Erratic amplitude
E. Out-of-phase signals - CORRECT ANSWER - Decreased signal strength
Transmitter failure
Erratic amplitude
When installing a higher-gain omnidirectional antenna, which of the following occurs? (Choose
two.)
A. The horizontal coverage increases.
B. The horizontal coverage decreases.
C. The vertical coverage increases.
D. The vertical coverage decreases. - CORRECT ANSWER - The horizontal coverage
increases.
,and
The vertical coverage decreases.
802.11ac VHT radios are backward compatible with which IEEE 802.11 radios?
A. 802.11 legacy (FHSS) radios
B. 802.11g (ERP) radios
C. 802.11 legacy (DSSS) radios
D. 802.11b (HR-DSSS) radios
E. 802.11a (OFDM) radios
F. 2.4 GHz 802.11n (HT) radios
G. 5 GHz 802.11n (HT) radios
H. None of the above - CORRECT ANSWER - 802.11a (OFDM) radios
and
5 GHz 802.11n (HT) radios
Which IEEE 802.11 amendment specifies the use of up to eight spatial streams of modulated
data bits?
A. IEEE 802.11n
B. IEEE 802.11g
C. IEEE 802.11ac
D. IEEE 802.11s
E. IEEE 802.11w - CORRECT ANSWER - IEEE 802.11ac
Which of the following measures the difference between the power of the primary RF signal
compared against the sum of the power of the RF interference and background noise?
A. Noise ratio
B. SNR
C. SINR
D. BER
, E. DFS - CORRECT ANSWER - SINR
Signal-to-interference-plus-noise (SINR)
What signal characteristics are common in spread spectrum and OFDM-based signaling
methods? (Choose two.)
A. Narrow bandwidth
B. Low power
C. High power
D. Wide bandwidth - CORRECT ANSWER - Low power
and
Wide bandwidth
A service set identifier is often synonymous with which of the following?
A. IBSS
B. ESSID
C. BSSID
D. BSS - CORRECT ANSWER - ESSID
Which CSMA/CA conditions must be met before an 802.11 radio can transmit? (Choose all that
apply.)
A. The NAV timer must be equal to zero.
B. The random back off timer must have expired.
C. The CCA must be idle.
D. The proper interframe space must have occurred.
E. The access point must be in PCF mode. - CORRECT ANSWER - The NAV timer must
be equal to zero.
The random back off timer must have expired.
