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In high-density environments, such as stadiums and convention centers, what extra factor has to be taken into account that can attenuate Wi-Fi signals when these environments are having an event?

A.

Thick walls

B.

I-Beams

C.

People

D.

Fire doors

Main Topic:Advanced Site Surveys

Question:

NicoCo is building a new facility and would like to install a WLAN for primary connectivity of all clients. The requirements are dual-spectrum 802.11n supporting voice and location tracking.

What type of pre-deployment survey should be performed?

A.

Passive, using optimized channels

B.

Active, using a voice handset

C.

Active, using a lowest common denominator client

D.

Predictive

E.

Passive, all channels

Main Topic:Infrastructure Design

Question:

An enterprise customer is subject to the highest standards for network uptime. When designing their wireless network, you should consider which of the following? (Choose all that apply)

A.

The failover of the wireless network only

B.

The failover of the wired network only

C.

The failover of the wireless and wired network

D.

The physical aspects such as power and cabling

A wireless engineer from your company performed a site survey in an office building where a wireless network extension was needed. He reports that while performing a Layer 1 sweep near a meeting room full of people, he detected RF activity with a very low duty cycle. He is unsure how to interpret what he recorded to determine its impact on a future Wi-Fi network.

What is true about this RF environment and its potential impact on the WLAN?

A.

The signal affects the entire spectrum and will render the wireless network unusable. It must be located and removed.

B.

The signal has a low duty cycle and should not be of major impact on the wireless network.

C.

The signal is alternating between peaks (high interference level) and valleys (low interference level). The network channel design must be built to avoid the affected peak frequencies.

D.

The signal is typical of a high radio card background noise. It shows that the card used for the Layer 1 sweep should be replaced and the Layer 1 sweep re-performed.

Main Topic:Post-Design ValidationandTroubleshooting

Question:

Excessive uplink RTP frame retransmissions can result in ____________.

A.

Deauthentication of the transmitter by the receiver

B.

Lowering of the data transmission rate by the transmitting station

C.

Head-of-Line blocking at the receiver

D.

MOS scores in excess of 5

In a PC-based spectrum analyzer, what data chart identifies the overall RF utilization of a specific frequency in the environment being surveyed?

A.

FFT Max Hold

B.

FFT Average

C.

Swept Spectrogram

D.

Duty Cycle

You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminary WLAN design specifies support for the 5 GHz spectrum, you would like to test for radar pulses to determine if DFS channels should be supported at this facility. As a part of your spectral survey with a laptop-based analyzer, you include DFS testing to identify the presence of radar. This is done by manually observing Real-time FFT, Duty Cycle, and Active Devices charts of the spectrum analyzer software.

What potential drawback is present with this DFS test method?

A.

Many WLAN products that support DFS channels report several false positives. Ideally, the actual WLAN equipment used in the deployment should be used to test for DFS.

B.

Some sources of 5 GHz radar, such as military ships, are mobile in nature. A longer, automated test setup should be used to identify the presence or absence of radar.

C.

Manual identification of radar pulses using spectrum analysis charts can be very difficult due to radar's low amplitude at the Wi-Fi receiver.

D.

Modern spectrum analyzer adapters do not provide the necessary bandwidth resolution required to detect and measure radar signatures.

When designing a wireless bridge to connect two offices 13 kilometers (approximately 8 miles) apart, which factor must the Wireless Engineer consider to account for Fresnel Zone clearance?

A.

Earth bulge

B.

Antenna gain

C.

FSPL

D.

Receive sensitivity

If the amplifier in Question 4 has a noise figure of 10 dB but a gain of 0 dB, what is the total noise figure of the cable, amplifier, and filter in series?

A.

75 dB

B.

16 dB

C.

10 dB

D.

70 dB

When surveying an existing WLAN infrastructure for a possible redesign, you use two Wi-Fi USB adapters to collect RSSI data and two USB spectrum analysis adapters to collect RF spectrum data. Since your laptop doesn't have enough USB ports, you use a 4-port powered USB 3.0 hub. What issues could be caused by the use of USB 3.0 that will impact your site survey?

A.

It does not give you enough bandwidth to collect data coming from all of the adapters.

B.

It does not give you enough power for all four of your adapters.

C.

It generates noise in the 2.4 GHz band, giving you a false perception of the noise floor.

D.

It generates noise in the 5 GHz band, giving you a false perception of the noise floor.