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CWNP CWNA-106 - Certified Wireless Network Administrator

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Total 120 questions

What phrase correctly completes the following sentence?

When using WMM Power Save operation, a wireless client device ______________.

A.

Alternates between awake and dozing, depending on its need to transmit and receive information

B.

Enters a low-power radio state until it receives a WMM PS-Poll frame from the AP

C.

Experiences higher throughput and lower latency than when operating in Active mode

D.

Powers down a subset of MIMO radio chains and transmits information at a slower data rate

E.

Buffers frames destined to the low-power AP until the AP wakes its radio and begins beaconing again

The client devices that connect to your network include a mix of dual-band 802.11n and 802.11ac, single-band 802.11b/g/n, and some 802.11a/g/n. Your access points are configured with the same SSID on both the 2.4 and 5 GHz bands. The APs are also configured to prioritize client connectivity to 5 GHz.

How does an AP perform band steering to encourage clients to use 5 GHz?

A.

When the client sends a probe request in the 2.4 GHz band, the AP may reply with information about the 5 GHz BSS.

B.

The AP may ignore the initial probe requests or 802.11 authentication requests sent in the 2.4 GHz band by dual-band clients

C.

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then send unicast channel switch announcements to the client announcing the 5 GHz channel as the new channel.

D.

After receiving probe request frames from the same client in both bands, the AP may send an association request frame to the client in the 5 GHz band.

E.

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then the AP may perform a transparent client handoff by transferring the client’s MAC address to the 5 GHz radio.

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

As a station moves away from the access point to which it is associated, it changes its data rate from 600 Mbps to 540 Mbps and then to 450 Mbps.

What IEEE 802.11 term is used to describe this functionality?

A.

Dynamic Rate Switching

B.

Multirate Control

C.

Modulation and Coding Selection

D.

Rate Set Selectivity

E.

Adaptive Rate Management

You have been sent as a consultant to a customer site that is experiencing problems with some 2.4 GHz clients on their 802.11a/g/n/ac network. After collecting information from the company about the problem, your initial troubleshooting step is to find a client device experiencing performance problems and observe its 802.11 frame exchanges in a protocol analyzer. The retransmission rate for that client is 65% instead of the company’s baseline, which is 9%.

Based on this information, what troubleshooting step should follow to isolate the problem?

A.

Check the frame decodes in the protocol analyzer and look for an excessive number of deauthentication frames.

B.

Evaluate the client’s operating frequency band with a spectrum analyzer, looking for a high noise floor or interference sources.

C.

Utilize a laptop-based site survey and planning tool to create a predictive model of the optimal AP placement in the customer’s facility.

D.

With a protocol analyzer, identify the client’s roaming threshold settings and reassociation behavior.

E.

Install Wi-Fi endpoint security and reporting software on the client device to monitor and log the retransmission behavior.

Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.

What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?

A.

A Voltage Standing Wave Ratio (VSWR) of 1:1

B.

An impedance mismatch between components in the RF system

C.

Cross-polarization of the RF signal as it passes through the RF system

D.

The use of cables longer than one meter in the RF system

E.

High output power at the transmitter and use of a low-gain antenna