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Explain why the statement "The network seems to be working OK so there must not be any RF interference." might be considered a wireless 'myth'.

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Because the IEEE 802.11 protocol is desi...

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In a wireless environment,a station might be in the range of an AP but not in the range of all other stations.

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The _________ floor indicates the weakest signal that can be received.

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What are four factors that influence system throughput?

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Access point processor speed
Distance fr...

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What is cochannel interference?

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WLANs that are in the same area can be a...

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When considering an outdoor network without obstructions,what do you need to keep in mind?


A) radio signals attenuate with the square of the distance
B) doubling the range requires double the power
C) antennas should be installed low to the ground
D) the SOM should be at least 25 dB

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Describe intersymbol interference.

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When an RF signal is transmitted, it doe...

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EMI is strictly a man-made electronic disturbance.

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The time difference of the arrival of signals as copies travel along different paths is referred to as which of the following?


A) system operating margin
B) return loss
C) multipath
D) delay spread

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Match each term with the correct statement below.

Premises
RF interference that affects the entire frequency band,such as the entire 2.4-GHz band
transmission problem involving two wireless devices,in which the wireless device closest to the AP transmits at a higher power than the other,more distant device,thereby overwhelming the weaker signal from the distant device
any undesirable electrical energy emitted within the frequency range dedicated to RF transmissions
an undesirable electronic disturbance,either manmade or natural,which causes an undesirable degrading in the performance of electrical equipment
a WLAN that uses a reduced power output from the AP; results in a smaller coverage area but can allow for increased performance due to channel reuse
an IP address that begins with the IP range 169.254.x.x and is assigned if a device cannot receive a valid IP
the area between two APs in which a wireless device begins to search for a new AP with which to associate
wireless networks that are used in areas in which large numbers of device are clustered close together
RF interference that covers all bands of the RF spectrum
RF interference that is usually generated by television,radio,and satellite transmitters
Responses
EMI
wideband interference
all-band interference
picocell
near/far
RFI
cell overlap
narrowband interference
APIPA
high-density WLANs

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RF interference that affects the entire frequency band,such as the entire 2.4-GHz band
transmission problem involving two wireless devices,in which the wireless device closest to the AP transmits at a higher power than the other,more distant device,thereby overwhelming the weaker signal from the distant device
any undesirable electrical energy emitted within the frequency range dedicated to RF transmissions
an undesirable electronic disturbance,either manmade or natural,which causes an undesirable degrading in the performance of electrical equipment
a WLAN that uses a reduced power output from the AP; results in a smaller coverage area but can allow for increased performance due to channel reuse
an IP address that begins with the IP range 169.254.x.x and is assigned if a device cannot receive a valid IP
the area between two APs in which a wireless device begins to search for a new AP with which to associate
wireless networks that are used in areas in which large numbers of device are clustered close together
RF interference that covers all bands of the RF spectrum
RF interference that is usually generated by television,radio,and satellite transmitters

The noise floor indicates the strongest signal that can be received.

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Which is true about wireless AP and device optimization?


A) using autonomous APs reduces TCO
B) always use picocell APs for large coverage areas
C) conservative roaming setting should be used for VoWiFi devices
D) devices should be set to maintain their wireless connection even when connected to a wired network

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Describe the noise floor.

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The noise floor is a measure o...

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One way to reduce ISI for outdoor settings is to use which type of antenna?


A) omnidirectional
B) unidirectional
C) highly-directional
D) multidirectional

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To ensure smooth roaming between coverage areas,which of the following must be true?


A) APs must use the same SSID and channel number
B) APs must use the same SSID and security settings
C) No cell overlap must be present
D) Channel and security settings must be different but SSID must be the same

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Which of the following is NOT a solution to the hidden node problem?


A) move the hidden node device
B) increase the client device's power
C) add another AP to the WLAN
D) increase the AP's power

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This type of interference can affect the entire 2.4 GHz band.


A) wideband
B) longband
C) multiband
D) narrowband

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If a wireless device is not connecting with the AP,what are the first two things you should check? (Choose two.)


A) wireless device and AP are configured for the same subnet
B) matching SSID
C) excessive collisions
D) security settings

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What happens when an RF signal moves through mediums of different densities?


A) it slows down
B) it bends
C) it speeds up
D) it scrambles

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If the wireless device is configured for DHCP yet no DHCP server is active,then Windows assigns a(n)____________________ IP Addressing address that begins with the IP range 169.254.x.x.

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Automatic ...

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Showing 21 - 40 of 41

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