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CWNP CWNA-106 - Certified Wireless Network Administrator

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Total 120 questions

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?

A.

Fresnel Zone size

B.

Maximum input power

C.

Beamwidth

D.

Impedance

E.

VSWR Ratio

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

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

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

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

In an 802.11n WLAN with a heterogeneous set of associated client devices including 802.11b, 11g, and 11n, what HT protection mode will the BSS use?

A.

Mode 0: No protection mode (Greenfield)

B.

Mode 1: Nonmember protection mode

C.

Mode 2: 20 MHz protection mode

D.

Mode 3: Non-HT mixed mode

What statement about the IEEE 802.11e QoS facility is true?

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.

What term correctly completes the following sentence?

802.11a/b/g used a mandatory 800ns guard interval. 802.11n introduced an optional short 400ns guard interval. Guard intervals (GI) are necessary in OFDM to reduce the likelihood of interference between two consecutive ____________.

A.

Frames

B.

Packets

C.

Segments

D.

Bits

E.

Bytes

F.

Symbols

The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).

What is the center frequency of channel 4?

A.

2.413 GHz

B.

2.417 GHz

C.

2.422 GHz

D.

2.427 GHz

E.

2.437 GHz

Which data rate is supported by 802.11g radios that is not supported by 802.11a radios?

A.

9 Mbps

B.

11 Mbps

C.

12 Mbps

D.

54 Mbps

E.

65 Mbps

F.

130 Mbps

In an 802.11n 2.4 GHz BSS, what prevents each station from using the full network bandwidth (e.g. 130 Mbps) for user data throughput when multiple clients are actively exchanging data with the AP? (Choose 2)

A.

Radio receiver hardware cannot process data as quickly as it can be transmitted.

B.

Half of the bandwidth is allocated to uplink traffic and half to downlink traffic.

C.

The DCF and EDCA coordination functions require backoff algorithms

D.

WLAN devices cannot detect collisions and must receive positive frame acknowledgment.

E.

APs do not have sufficient wired connection speeds to the LAN.

If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and reflected paths, what effect will the reflected signal have on the signal that took the direct line-of-sight path?

A.

The direct signal will only be received if the reflected signal is more than 180 degrees out of phase.

B.

The direct signal cannot be received if the indirect signal is less than 90 degrees out-of-phase.

C.

The signals will be distorted if the indirect signal arrives simultaneously at the receiver, but 90 degrees out-of-phase.

D.

If the signals are in-phase, they will combine together, cancel one another out, and create a null.