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CWNP CWNA-106 - Certified Wireless Network Administrator

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Total 120 questions

In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latency-sensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?

A.

The current AP is using channel 1 and the new AP is using channel 40.

B.

The SSID of the current AP does not match the SSID of the new AP.

C.

The current AP supports only HT and the new AP is VHT capable.

D.

The access points are hiding the SSID in Beacons and Probe Response frames.

What problems may exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? (Choose 2)

A.

Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance.

B.

WLAN client stations can experience the hidden node problem when located near each other within the same cell.

C.

The mismatched power between WLAN client stations and APs violates regulatory and IEEE signal quality requirements.

D.

Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.

E.

APs operating in the 2.4 GHz band would prevent microwave ovens and analog video cameras from functioning.

What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?

A.

Military radar

B.

Properly configured AP

C.

Microwave oven

D.

Wireless video camera

E.

WIPS sensor

A Wi-Fi Alliance interoperability certificate indicates that a device is a/b/g/n certified. It further indicates one transmit and receive spatial stream for both the 2.4 GHz and 5.0 GHz bands. It further indicates support for both WPA and WPA2 Enterprise and Personal. Finally, it indicates support for EAP-TLS, EAP-TTLS/MSCHAPv2, PEAPv0/EAP-MSCHAPv2 and PEAPv1/EAP-GTC. Which one of the following statements is false?

A.

This client device supports protection mechanisms such as RTS/CTS and/or CTS-to-Self.

B.

This client device supports both TKIP and CCMP cipher suites.

C.

300 Mbps is the maximum supported data rate for this device.

D.

This client device supports the ERP, OFDM, and HT physical layer specifications.

E.

This client device supports X.509 certificates for EAP authentication.

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.

An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain.

What is the EIRP power output?

A.

10 mW

B.

25 mW

C.

50 mW

D.

250 mW

E.

1000 mW

What three cipher suites are specified by the IEEE 802.11-2012 standard? (Choose 3)

A.

Counter Mode with CBC-MAC Protocol

B.

Wi-Fi Protected Access v1 and v2

C.

Internet Protocol Security

D.

Extensible Authentication Protocol

E.

GCM with Galois Message Authentication Code (GMAC) Protocol

F.

Wired Equivalent Privacy

G.

Temporal Key Integrity Protocol

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)

A.

Data frames too large for the physical environment

B.

Client stations broadcasting with too much power

C.

Access points broadcasting with too little power

D.

Client stations too close in proximity to each other

E.

Obstacles between client stations causing attenuation

F.

Large 802.11 cells with physically distributed stations

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

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.

Users and Network support personnel at a mid-sized equipment manufacturer have been discussing the potential uses and benefits of implementing an indoor WLAN. The network administrator and network manager have requested a meeting of senior management personnel to discuss a WLAN implementation before performing a site survey or taking any implementation steps. The first topic of discussion in the meeting is the corporate policy concerning implementation and use of WLAN technology.

What specific topics are appropriate in this policy meeting? (Choose 2)

A.

Use of the latest 802.11ac equipment

B.

Business justification

C.

User productivity impact

D.

Antenna types

E.

Defining RF channels for use