Wireless Site Survey Engineer Exam Practice Test
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Questions and Answers
- 1.
The Crocker company has generated a visual model of RF coverage for their building b y using predictive modeling site survey software. The next step requires validation with a manual site survey. What modeling parameters should be validated during the manual site survey?
- A.
AP placement and power settings
- B.
Throughput
- C.
Coverage boundaries
- D.
. Encryption settings
- E.
Roaming parameters
Correct Answer(s)
A. AP placement and power settings
C. Coverage boundariesExplanation
During the manual site survey, the modeling parameters that should be validated are AP placement and power settings, as well as coverage boundaries. AP placement and power settings need to be verified to ensure that the access points are positioned optimally and transmitting at the correct power levels for optimal coverage. Additionally, coverage boundaries need to be validated to confirm that the predicted RF coverage matches the actual coverage in the building. This will help ensure that the wireless network provides the intended coverage and performance.Rate this question:
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- 2.
) Which potential regional weather conditions can adversely affect an outdoor wireless bridge link and should be noted during an outdoor site survey? (Choose two that apply.)
- A.
. Lightning
- B.
Dew point
- C.
Wind
- D.
Cloud cover
- E.
Thunder
Correct Answer(s)
A. . Lightning
C. WindExplanation
Lightning and wind can both adversely affect an outdoor wireless bridge link. Lightning can cause electrical surges that can damage the equipment, while strong winds can cause the bridge to sway or move, potentially disrupting the signal. Both of these factors should be taken into consideration during an outdoor site survey to ensure the stability and reliability of the wireless bridge link.Rate this question:
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- 3.
Name the major types of coverage analysis site surveys. (Choose three that apply.)
- A.
Assisted
- B.
. Self-organizing
- C.
Manual
- D.
Capacity
- E.
Predictive
Correct Answer(s)
A. Assisted
C. Manual
E. PredictiveExplanation
The major types of coverage analysis site surveys are Assisted, Manual, and Predictive. Assisted site surveys involve the use of specialized tools or equipment to analyze and optimize wireless coverage. Manual site surveys require a technician to physically visit the site and conduct measurements and analysis. Predictive site surveys use software and mathematical models to simulate and predict wireless coverage based on various factors such as building materials and layout. These three types of surveys provide different approaches to analyzing and improving wireless coverage in different scenarios.Rate this question:
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- 4.
) ACME Hospital uses a connection-oriented telemetry monitoring system in the cardiac care unit. Management wants the application avalable of a WLAN. Uptime is very important because of the critical nature of the monitoring system. What should the site survey engineer be looking for that might cause a loss of communication over the WLAN? (Choose three that apply.)
- A.
. Medical equipment interference
- B.
Safety glass
- C.
Patients
- D.
Bedpans
- E.
Elevator shafts
Correct Answer(s)
A. . Medical equipment interference
B. Safety glass
E. Elevator shaftsExplanation
The site survey engineer should be looking for medical equipment interference, safety glass, and elevator shafts that might cause a loss of communication over the WLAN. Medical equipment interference can disrupt the wireless signals and cause communication issues. Safety glass can block or weaken the wireless signals, leading to a loss of communication. Elevator shafts can also interfere with the wireless signals and cause communication problems.Rate this question:
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- 5.
Which type of coverage analysis requires a radio card to be associated to an access point?
- A.
. Associated
- B.
Passive
- C.
. Predictive
- D.
Assisted
- E.
Active
Correct Answer
E. ActiveExplanation
Active coverage analysis requires a radio card to be associated with an access point. This type of analysis involves actively sending and receiving signals to measure and analyze the coverage and performance of a wireless network. By associating the radio card with an access point, it can actively transmit and receive signals to determine the strength and quality of the network's coverage in different areas. This allows for real-time analysis and optimization of the wireless network's coverage.Rate this question:
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- 6.
Which of the following tools can be used in an indoor site survey? (Choose three that apply.)
- A.
Measuring wheel
- B.
GPS
- C.
Ladder
- D.
Battery pack
- E.
Microwave oven
Correct Answer(s)
A. Measuring wheel
C. Ladder
D. Battery packExplanation
A measuring wheel can be used in an indoor site survey to measure distances accurately. A ladder can be used to access higher areas and inspect them properly. A battery pack can be used to power equipment and tools during the survey. GPS, microwave oven are not relevant tools for an indoor site survey.Rate this question:
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- 7.
) Which of the following tools might be used in an outdoor site survey used to provide outdoor coverage? (Choose all that apply.)
- A.
Spectrum Analyzer
- B.
NEMA grade access point
- C.
Outdoor blueprints or topography map
- D.
Mesh routers
- E.
GPS
Correct Answer(s)
A. Spectrum Analyzer
B. NEMA grade access point
C. Outdoor blueprints or topography map
D. Mesh routers
E. GPSExplanation
In an outdoor site survey used to provide outdoor coverage, several tools can be used. A spectrum analyzer is used to analyze the frequency spectrum and identify any interference or congestion in the area. A NEMA grade access point is designed to withstand outdoor conditions and provide wireless coverage in outdoor environments. Outdoor blueprints or topography maps are used to understand the layout and terrain of the outdoor area, helping in planning the coverage. Mesh routers can be used to extend the wireless coverage in a mesh network configuration. GPS can be used to accurately determine the location coordinates of the survey points.Rate this question:
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- 8.
) Name two potential sources of interference in the 5 GHz UNII band.
- A.
Microwave oven
- B.
Cordless phones
- C.
FM radios
- D.
. Radar
- E.
Nearby 802.11b/g WLAN
Correct Answer(s)
B. Cordless phones
D. . RadarExplanation
The two potential sources of interference in the 5 GHz UNII band are cordless phones and radar. Cordless phones operate in the same frequency range as the 5 GHz UNII band, which can cause interference and degrade the performance of wireless networks. Radar systems, especially military or weather radars, can also operate in the 5 GHz frequency range and cause interference. It is important to be aware of these potential sources of interference when deploying or troubleshooting wireless networks in the 5 GHz UNII band.Rate this question:
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- 9.
Which of these measurements are taken during passive manual site survey? (Choose two that apply.)
- A.
. SNR
- B.
DBi
- C.
DBm
- D.
DBd
Correct Answer(s)
A. . SNR
C. DBmExplanation
During a passive manual site survey, two measurements that are taken are SNR (Signal-to-Noise Ratio) and dBm (decibel-milliwatts). SNR measures the ratio of the signal power to the background noise power, indicating the quality of the signal. dBm is a unit of power measurement that represents the power level in decibels relative to one milliwatt. These measurements help in assessing the signal strength and quality of the wireless network during a passive manual site survey.Rate this question:
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- 10.
) Mr. Cherry is the site survey engineer for the ACME Corporation, which wants to deploy a VoWiFi network. Because of the latency requirements of VoIP, he is concernted about layer 2 retransmissions. A spectrum analysis site survey has determined that there are no sources of RF interference. During the active survey of manual coverage, he finds a layer 2 retry rate exceeding 15 percent in some areas of the facility but not others. What is the likely cause of the layer 2 retransmissions?
- A.
Cellular phone system
- B.
Free space path loss
- C.
Brick walls
- D.
Multipath
- E.
High density of users
Correct Answer
D. MultipathExplanation
The likely cause of the layer 2 retransmissions is multipath. Multipath refers to the phenomenon where the wireless signal takes multiple paths to reach the receiver due to reflections, diffraction, and scattering. In some areas of the facility, the signal may encounter obstacles such as walls or other objects that cause reflections and create multiple paths for the signal. This can lead to interference and signal degradation, resulting in layer 2 retransmissions.Rate this question:
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- 11.
) Name the necessary calculations for an outdoor bridging survey under five miles? (Choose four that apply.)
- A.
. Link budget
- B.
Free space path loss
- C.
. Fresnel zone
- D.
Fade margin
- E.
Height of the antenna beamwidth
Correct Answer(s)
A. . Link budget
B. Free space path loss
C. . Fresnel zone
D. Fade marginExplanation
The necessary calculations for an outdoor bridging survey under five miles include the link budget, free space path loss, Fresnel zone, and fade margin. The link budget calculation helps determine the overall gain and loss in a communication system. Free space path loss calculates the signal attenuation over a distance in free space. The Fresnel zone calculation ensures that there is minimal interference due to obstacles in the transmission path. The fade margin calculation provides a buffer for any potential signal fading or loss. The height of the antenna beamwidth is not directly related to the necessary calculations for an outdoor bridging survey under five miles.Rate this question:
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- 12.
Name potential sources of interference that might be found during a 2.4GHz site survey. (Choose four that apply.)
- A.
Toaster oven
- B.
Nearby 802.11 FHSS access point
- C.
Plasma cutter
- D.
Bluetooth headset
- E.
2.4 GHz video camera
Correct Answer(s)
B. Nearby 802.11 FHSS access point
C. Plasma cutter
D. Bluetooth headset
E. 2.4 GHz video cameraExplanation
During a 2.4GHz site survey, potential sources of interference that might be found include a nearby 802.11 FHSS access point, which operates on the same frequency and can cause interference; a plasma cutter, which can emit electromagnetic interference; a Bluetooth headset, which operates on the same frequency and can cause interference; and a 2.4 GHz video camera, which can also operate on the same frequency and cause interference.Rate this question:
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- 13.
) Which of the following tools can be used in an indoor 802.11 site survey? (Choose four that apply.)
- A.
Multiple antennas
- B.
902 to 928 MHz spectrum analyzer
- C.
Client adapter
- D.
Access point
- E.
Floor plan map
Correct Answer(s)
A. Multiple antennas
C. Client adapter
D. Access point
E. Floor plan mapExplanation
Multiple antennas, client adapter, access point, and floor plan map can be used in an indoor 802.11 site survey. Multiple antennas are used to measure signal strength and coverage. A client adapter is used to connect to the wireless network and test the performance. An access point is used to create the wireless network and can be used to measure signal strength and coverage. A floor plan map is used to plan and visualize the coverage areas and signal propagation in the indoor environment.Rate this question:
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- 14.
Ms. Williams is a site survey engineer who is planning to deploy a wireless controller solution with dual-radio, dual-frequency lightweight access points. The employees will be assigned to the 5GHz network and the guest users will be assigned to the 2.4GHz network. CCMP/AES encryption will be required for the employees, while the guest users will only use static WEP. Name the possible choices that Mr. Williams has for coverage analysis? (Choose the two best answers.)
- A.
. Conduct a predictive site survey for the 5GHz network and an assisted site survey for the 2.4 GHz network.
- B.
. Install the thin access points in a grid and conduct an assisted site survey for both networks.
- C.
Conduct manual coverage analysis for the 2.4 GHz network first and then conduct manual coverage analysis for the 5GHz network.
- D.
Conduct a predictive site survey for the 2.4 GHz network and an assisted site survey for the 5GHz network.
- E.
. Conduct manual coverage analysis for the 5GHz network first and then conduct manual coverage analysis for the 2.4 GHz network based on teh AP placement of the 5GHz APs.
Correct Answer(s)
B. . Install the thin access points in a grid and conduct an assisted site survey for both networks.
E. . Conduct manual coverage analysis for the 5GHz network first and then conduct manual coverage analysis for the 2.4 GHz network based on teh AP placement of the 5GHz APs.Explanation
The two best choices for coverage analysis in this scenario are to install the thin access points in a grid and conduct an assisted site survey for both networks, and to conduct manual coverage analysis for the 5GHz network first and then conduct manual coverage analysis for the 2.4 GHz network based on the AP placement of the 5GHz APs. These choices ensure that both networks are properly analyzed and optimized for coverage and performance. The first choice allows for a comprehensive analysis of both networks using an assisted site survey, while the second choice prioritizes the 5GHz network and uses the placement of the 5GHz APs as a guide for the coverage analysis of the 2.4 GHz network.Rate this question:
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- 15.
Bob has to perform a site survey for a WLAN by using a multiple channel architecture (MCA) system in a 20-story building with multiple tenants. What should Bob consider during the planning and implementation stages of the site survey? (Choose two that apply.)
- A.
Other tenants' WLANs
- B.
Only WLAN controller solutions with lightweight APs should be deployed and not autonomous access points.
- C.
Access points should use high-gain omnidirectional antennas to provide coverage across multiple floors.
- D.
Access points should be at full transmit power to provide coverage across multiple floors.
- E.
. The cell coverage of each access point should extend to only one floor above and one floor below to create a three-dimensional channel reuse pattern.
Correct Answer(s)
A. Other tenants' WLANs
E. . The cell coverage of each access point should extend to only one floor above and one floor below to create a three-dimensional channel reuse pattern.Explanation
Bob should consider other tenants' WLANs during the planning and implementation stages of the site survey because they can cause interference and affect the performance of his WLAN. He should also ensure that the cell coverage of each access point extends to only one floor above and one floor below to create a three-dimensional channel reuse pattern. This helps to minimize interference between neighboring access points and optimize the overall performance of the WLAN in the 20-story building.Rate this question:
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- 16.
Which of the following tools may be found within an indoor site survey kit? (Choose three that apply.)
- A.
Digital camera
- B.
Colored electrical tape
- C.
Grid antenna
- D.
Access point enclosure unit
- E.
. Temporary mounting gear
Correct Answer(s)
A. Digital camera
B. Colored electrical tape
E. . Temporary mounting gearExplanation
An indoor site survey kit is used to assess the wireless coverage and performance within a building or indoor space. A digital camera can be used to capture images of the physical layout and obstacles that may affect signal propagation. Colored electrical tape can be used to mark specific areas or identify potential signal interference sources. Temporary mounting gear is necessary to temporarily install access points or antennas in different locations for testing purposes. Therefore, these three tools are commonly included in an indoor site survey kit.Rate this question:
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- 17.
Ms. Turner is a site survey engineer who has to deploy eighty 2.4 GHz lightweight access points in a warehouse with long corridors and metal racks. A WLAN controller will be used to manage all the access points. Six hundred bar code scanners will be deployed throughout the warehouse using WPA2-Personal for security. Which is the most important site survey tool to ensure the best performance throughout the warehouse?
- A.
802.11a/b/g multistation emulator
- B.
Directional antennas
- C.
Predictive analysis software
- D.
Security analysis software
- E.
All of the above
Correct Answer
B. Directional antennasExplanation
Directional antennas would be the most important site survey tool in this scenario because they can provide focused and concentrated wireless coverage in specific areas. In a warehouse with long corridors and metal racks, directional antennas can help overcome obstacles and interference by directing the wireless signal towards the desired areas, ensuring better performance and coverage for the bar code scanners. This would help optimize the wireless network and improve the overall quality of the connection in the warehouse environment.Rate this question:
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- 18.
What access point settings should be recorded during manual coverage analysis? (Choose two that apply.)
- A.
Power settings
- B.
Encryption settings
- C.
Authentication settings
- D.
Channel setting
- E.
IP address
Correct Answer(s)
A. Power settings
D. Channel settingExplanation
During manual coverage analysis, it is important to record the power settings and channel setting of the access point. Power settings determine the strength of the signal, which can affect the coverage range. Channel setting refers to the specific frequency channel used by the access point, which can also impact coverage and interference. Recording these settings helps in analyzing and optimizing the coverage area of the access point. The other options, such as encryption settings, authentication settings, and IP address, are not directly related to coverage analysis and may not have a significant impact on it.Rate this question:
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- 19.
Which type of manual coverage analysis does not requires a radio card to be associated to an access point?
- A.
Associated
- B.
Passive
- C.
Predictive
- D.
. Assisted
- E.
Active
Correct Answer
B. PassiveExplanation
Passive manual coverage analysis does not require a radio card to be associated with an access point. This type of analysis involves monitoring and collecting data from existing network traffic without actively participating in the network. It is a non-intrusive method that allows for the assessment of coverage and signal strength without the need for additional hardware or active involvement in the network.Rate this question:
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- 20.
Which type of site survey uses modeling algorithms and attenuation values to create visual models of RF coverage cells?
- A.
Associated
- B.
Passive
- C.
Predictive
- D.
Assisted
- E.
Active
Correct Answer
C. PredictiveExplanation
Predictive site surveys use modeling algorithms and attenuation values to create visual models of RF coverage cells. This type of survey does not require physically visiting the site, as it uses software to predict and simulate the RF coverage based on various factors such as building materials, obstacles, and antenna placements. By analyzing these models, network planners can determine the optimal placement of access points and predict the expected RF coverage and performance in different areas of the site.Rate this question:
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- 21.
The IEEE 802.3af amendment has been incorporated into the IEEE Std. 802.3-2005 revised standard and is defined in which clause?
- A.
Clause 15
- B.
Clause 17
- C.
Clause 19
- D.
Clause 33
- E.
Clause 43
Correct Answer
D. Clause 33Explanation
The correct answer is Clause 33. The IEEE 802.3af amendment, which deals with power over Ethernet, has been incorporated into the IEEE Std. 802.3-2005 revised standard. This amendment is defined in Clause 33 of the standard.Rate this question:
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- 22.
If a classification signature is not provided, the device is considered to be in what class?
- A.
0
- B.
1
- C.
2
- D.
3
- E.
4
Correct Answer
A. 0Explanation
If a classification signature is not provided, the device is considered to be in class 0. This means that the device does not have any specific classification and is not categorized into any particular class.Rate this question:
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- 23.
Which types of PoE devices are defined by the standard? (Choose two that apply)
- A.
. PSE
- B.
. PPE
- C.
PD
- D.
PT
Correct Answer(s)
A. . PSE
C. PDExplanation
The correct answer is PSE and PD. PSE stands for Power Sourcing Equipment, which refers to devices that provide power to other devices over Ethernet cables. PD stands for Powered Device, which refers to devices that receive power from PSEs over Ethernet cables. PPE and PT are not types of PoE devices defined by the standard.Rate this question:
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- 24.
A powered device (PD) must be capable of accepting up to how many volts from either the data lines or the unused pares of the Ethernet cable?
- A.
14.5 volts
- B.
. 20.5 volts
- C.
48 volts
- D.
57 volts
Correct Answer
D. 57 voltsExplanation
A powered device (PD) must be capable of accepting up to 57 volts from either the data lines or the unused pairs of the Ethernet cable. This means that the PD should be able to handle a maximum voltage of 57 volts to ensure proper functioning and compatibility with the power source.Rate this question:
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- 25.
) To qualify as compliant with 802.3-2005, Clause 33, a powered device (PD) must do which of the following? (Choose three that apply)
- A.
Be able to accept power in either of two ways: over the data pairs or over the unused pairs.
- B.
Reply to the PSE with a detection signature.
- C.
Accept power with either polarity from the PSE.
- D.
Reply to the PSE with a classification signature.
Correct Answer(s)
A. Be able to accept power in either of two ways: over the data pairs or over the unused pairs.
B. Reply to the PSE with a detection signature.
C. Accept power with either polarity from the PSE.Explanation
To qualify as compliant with 802.3-2005, Clause 33, a powered device (PD) must be able to accept power in either of two ways: over the data pairs or over the unused pairs. It must also reply to the PSE with a detection signature and accept power with either polarity from the PSE.Rate this question:
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- 26.
A VoIP telephone is connected to a 24-port PoE midspan PSE. If the telephone does not provide a classification signature, how much power will the PSE provide to the telephone?
- A.
. 0 watts (The telephone would not be recognized as a PD.)
- B.
4.0 watts
- C.
7.0 watts
- D.
15.4 watts
Correct Answer
D. 15.4 wattsExplanation
If the VoIP telephone does not provide a classification signature, the PSE (Power Sourcing Equipment) will not recognize it as a powered device (PD). Therefore, the PSE will not provide any power to the telephone, resulting in 0 watts of power being supplied.Rate this question:
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- 27.
) An endpoint PSE that provides power by using Alternative B is capable of providing power to devices by using which of the following Ethernet technologies? (Choose two that apply)
- A.
10BaseT
- B.
100BaseT
- C.
1000BaseT
- D.
100BaseFX
Correct Answer(s)
A. 10BaseT
B. 100BaseTExplanation
An endpoint PSE that provides power by using Alternative B is capable of providing power to devices using 10BaseT and 100BaseT Ethernet technologies. These technologies are both capable of carrying power over Ethernet (PoE) and can support the power requirements of devices connected to the PSE. 1000BaseT and 100BaseFX are not capable of carrying power over Ethernet, so they are not applicable in this scenario.Rate this question:
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- 28.
) Which of the following devices provide power over the spare pairs of the Ethernet cable?
- A.
Single-port power injector
- B.
. Multiport power injector
- C.
Midspan PSE
- D.
. Endpoint PSE, Alternative B
Correct Answer(s)
A. Single-port power injector
B. . Multiport power injector
C. Midspan PSE
D. . Endpoint PSE, Alternative BExplanation
The correct answer is Single-port power injector, Multiport power injector, Midspan PSE, Endpoint PSE. These devices are capable of providing power over the spare pairs of the Ethernet cable.Rate this question:
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- 29.
) At maximum power requirements, a 24-port PoE Ethernet switch must be able to provide about how many total watts of power to PoE devices on all ports?
- A.
15.4 watts
- B.
370 watts
- C.
1000 watts
- D.
Not enough information is provided to answer the question
Correct Answer
B. 370 wattsExplanation
A 24-port PoE Ethernet switch must be able to provide a maximum of 15.4 watts of power to each PoE device connected to all ports. Since there are 24 ports, the total power required would be 15.4 watts multiplied by 24, which equals 370 watts.Rate this question:
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- 30.
If an 802.3-2005 Clause 33 access point is equipped with two radios and requires 7.5 watts of power, how much power will the PSE provide to it?
- A.
. 7.5 watts
- B.
10.1 watts
- C.
15 watts
- D.
15.4 watts
Correct Answer
D. 15.4 wattsExplanation
The PSE (Power Sourcing Equipment) will provide 15.4 watts of power to the 802.3-2005 Clause 33 access point equipped with two radios. This is the maximum power that can be provided by the PSE.Rate this question:
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- 31.
The PSE provides power within a range of ____________ volts, with a nominal power of ________ volts.
- A.
14.5 to 20.5, 18
- B.
6.49 to 12.95, 10.1
- C.
12 to 19, 15.4
- D.
44 to 57, 48
Correct Answer
D. 44 to 57, 48Explanation
The correct answer is 44 to 57, 48. This means that the PSE (Power Sourcing Equipment) is capable of providing power within a range of 44 to 57 volts. However, the nominal power, or the average or standard power output, is 48 volts. This suggests that the PSE typically operates at 48 volts, but can provide power within a wider range if necessary.Rate this question:
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- 32.
You have installed an Thernet switch that is compliant with 802.3-2005, Clause 33. You are having problems with your access points. Which of the following could be causing your problems?
- A.
Many PoE VoIP telephones are connected to the same Ethernet switch.
- B.
Most of the Ethernet cables running from the switch to the APs are 90 meters long
- C.
The Ethernet cables are only Cat 5e.
- D.
The switch is capable of 1000BaseT, which is not compatible with VoIP telephones.
Correct Answer
A. Many PoE VoIP telephones are connected to the same Ethernet switch.Explanation
Many PoE VoIP telephones connected to the same Ethernet switch can cause problems because the switch might not have enough power to provide PoE to all the devices simultaneously. This can lead to unstable connections or devices not receiving power at all.Rate this question:
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- 33.
You are designing an 802.3-2005 Clause 33 network and are installing a 24-port Ethernet switch to support 10 Class-1 VoIP phones and 10 Class-0 access points. The switch requires 500 watts to perform its basic switching functions. How much total power will be needed?
- A.
. 500 watts
- B.
. 694 watts
- C.
. 808 watts
- D.
1000 watts
Correct Answer
B. . 694 wattsExplanation
The total power needed will be 694 watts. This is because the switch requires 500 watts for its basic switching functions. Additionally, there are 10 Class-1 VoIP phones and 10 Class-0 access points, which will require additional power. However, the exact power requirements for these devices are not specified in the question, so we cannot determine the exact amount of power needed. Therefore, the total power needed is 500 watts (for the switch) plus an unspecified amount for the phones and access points.Rate this question:
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- 34.
) You are designing an 802.3-2005 Clause 33 network and are installing a 24-port Ethernet switch to support 10 Class-2 cameras and 10 Class-3 access points. The switch requires 1000 watts to perform its basic switching functions. How much total power will be needed?
- A.
1,080 watts
- B.
. 1,224 watts
- C.
1,308 watts
- D.
. 1,500 watts
Correct Answer
B. . 1,224 wattsExplanation
Based on the information provided, the switch requires 1000 watts to perform its basic switching functions. Additionally, there are 10 Class-2 cameras and 10 Class-3 access points connected to the switch. Each Class-2 camera requires up to 4.5 watts of power, while each Class-3 access point requires up to 15.4 watts of power. Therefore, the total power needed can be calculated by adding the power requirements of the switch, cameras, and access points: 1000 + (10 * 4.5) + (10 * 15.4) = 1000 + 45 + 154 = 1199 watts. Since none of the given options match this calculation, the correct answer is not available.Rate this question:
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- 35.
When a powered device is first connected to a PSE, it presents itself as having a resistance level of what?
- A.
. 25-ohms
- B.
50-ohms
- C.
25k-ohms
- D.
. 50k-ohms
Correct Answer
C. 25k-ohmsExplanation
When a powered device is first connected to a PSE (Power Sourcing Equipment), it presents itself as having a resistance level of 25k-ohms.Rate this question:
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- 36.
How much voltage does the PSE apply while trying to identify the detection signature?
- A.
. 5 volts
- B.
10.1 volts
- C.
12 volts
- D.
48 volts
Correct Answer
B. 10.1 voltsExplanation
The PSE (Power Sourcing Equipment) applies a voltage of 10.1 volts while trying to identify the detection signature. This voltage is used to determine if a connected device is a valid powered device and to establish communication with it.Rate this question:
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- 37.
What is the maximum power used by a PD Class 0 device?
- A.
3.84 W
- B.
6.49 W
- C.
12.95 W
- D.
15.4 W
Correct Answer
C. 12.95 WExplanation
The maximum power used by a PD Class 0 device is 12.95 W. This means that the device can consume up to 12.95 watts of power.Rate this question:
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- 38.
The PSE will apply a voltage of between 14.5 and 20.5 and measure the resulting current to determine the class of the device. Which current range represents Class 2 devices?
- A.
0 - 4 mA
- B.
5 - 8 mA
- C.
. 9 - 12 mA
- D.
13 - 26 mA
- E.
17 - 20 mA
Correct Answer
E. 17 - 20 mAExplanation
Class 2 devices are determined by measuring the resulting current when a voltage is applied. The current range that represents Class 2 devices is 17 - 20 mA.Rate this question:
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- 39.
A powered device must be capable of accepting power with either polarity from the power supply. In mode A, on which conductors/wires does the powered device accept power?
- A.
1, 2, 3, 4
- B.
. 5, 6, 7, 8
- C.
1, 2, 3, 6
- D.
4, 5, 7, 8
Correct Answer
C. 1, 2, 3, 6Explanation
The powered device accepts power on conductors/wires 1, 2, 3, and 6.Rate this question:
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- 40.
An 802.3-2005 Clause 33 midspan PSE can be used with which of the following networking devices? (Choose two that apply)
- A.
10BaseT repeater
- B.
100BaseT layer 2 switch
- C.
1000BaseT layer 2 switch
- D.
1000BaseT layer 3 switch
Correct Answer(s)
A. 10BaseT repeater
B. 100BaseT layer 2 switchExplanation
An 802.3-2005 Clause 33 midspan PSE (Power Sourcing Equipment) can be used with both a 10BaseT repeater and a 100BaseT layer 2 switch. These devices are compatible with the power requirements and standards of the midspan PSE. However, a 1000BaseT layer 2 switch and a 1000BaseT layer 3 switch are not compatible with the midspan PSE as they operate at higher data rates and may have different power requirements.Rate this question:
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- 41.
) A WLAN consultant has been asked to plan an 802.11n Greenfield deployment using dual-frequency 4×4 MIMO access points. What are the options available to provide power for the 802.1n access points? (Choose two that apply.)
- A.
802.3-2005 clause 33 PoE
- B.
802.3AT PoE
- C.
. Proprietary PoE solution
- D.
Battery pack
- E.
. Electrical outlet power
Correct Answer(s)
C. . Proprietary PoE solution
E. . Electrical outlet powerExplanation
The options available to provide power for the 802.11n access points are a proprietary PoE solution and electrical outlet power. A proprietary PoE solution refers to a power over Ethernet solution that is specific to the manufacturer or vendor of the access points. This means that the access points can be powered using Ethernet cables, eliminating the need for separate power cables. Electrical outlet power refers to plugging the access points directly into a power outlet using a power adapter. Both of these options provide a reliable and convenient way to power the access points in a Greenfield deployment.Rate this question:
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- 42.
) How can a MIMO system increase throughput at the Physical layer? (Choose three that apply.)
- A.
Spatial multiplexing
- B.
A-MPDU
- C.
Transmit beamforming
- D.
40 MHz channels
- E.
Dual-CTS protection
Correct Answer(s)
A. Spatial multiplexing
C. Transmit beamforming
D. 40 MHz channelsExplanation
A MIMO system can increase throughput at the Physical layer through spatial multiplexing, transmit beamforming, and the use of 40 MHz channels. Spatial multiplexing allows multiple data streams to be transmitted simultaneously on different antennas, increasing the overall data rate. Transmit beamforming focuses the transmitted signal towards the intended receiver, improving signal strength and reducing interference. The use of 40 MHz channels allows for wider bandwidth, enabling higher data transmission rates.Rate this question:
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- 43.
) Which new power-management method defined by the 802.11n amendment conserves power by powering down all but one radio?
- A.
A-MPDU
- B.
. Power Save protection
- C.
PSMP
- D.
SM power save
- E.
PS mode
Correct Answer
D. SM power saveExplanation
SM power save is a power-management method defined by the 802.11n amendment that conserves power by powering down all but one radio. This method allows devices to enter a power-saving mode where only one radio remains active, reducing power consumption while still maintaining connectivity.Rate this question:
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- 44.
) The guard interval is used as a buffer to compensate for what type of interference?
- A.
Co-channel interference
- B.
Adjacent cell interference
- C.
. RF interference
- D.
HT interference
- E.
Intersymbol interference
Correct Answer
E. Intersymbol interferenceExplanation
The guard interval is used as a buffer to compensate for intersymbol interference. Intersymbol interference occurs when the symbols of a digital signal overlap due to channel distortion or other factors. The guard interval allows for a small amount of time between symbols, which helps to reduce the interference and ensure accurate signal transmission.Rate this question:
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- 45.
) Name some of the factors that a modulation and coding scheme (MCS) uses to define data rates for an HT radio. (Choose all that apply.)
- A.
. Modulation method
- B.
Equal/unequal modulation
- C.
Number of spatial streams
- D.
. GI
- E.
Channel size
Correct Answer(s)
A. . Modulation method
B. Equal/unequal modulation
C. Number of spatial streams
D. . GI
E. Channel sizeExplanation
A modulation and coding scheme (MCS) uses several factors to define data rates for an HT radio. The modulation method refers to the technique used to encode information onto the carrier signal, such as BPSK, QPSK, or 16-QAM. Equal/unequal modulation refers to whether all spatial streams use the same modulation or if they can use different modulations. The number of spatial streams indicates the number of simultaneous data streams transmitted over different antennas. The guard interval (GI) is the duration of a cyclic prefix inserted between symbols to mitigate multipath interference. Channel size refers to the bandwidth allocated for transmission. All these factors are considered by an MCS to determine the data rates for an HT radio.Rate this question:
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- 46.
How can an HT radio increase throughput at the MAC sublayer of the Data-Link layer? (Choose four that apply.)
- A.
. A-MSDU
- B.
. RIFS
- C.
A-MPDU
- D.
Guard interval
- E.
. MTBA
Correct Answer(s)
A. . A-MSDU
B. . RIFS
C. A-MPDU
E. . MTBAExplanation
An HT radio can increase throughput at the MAC sublayer of the Data-Link layer through the following methods:
1. A-MSDU (Aggregated MAC Service Data Unit): This technique allows multiple MAC service data units to be combined into a single frame, reducing overhead and increasing efficiency.
2. RIFS (Reduced Interframe Space): By reducing the interframe space between frames, the HT radio can decrease the idle time and increase the overall throughput.
3. A-MPDU (Aggregated MAC Protocol Data Unit): Similar to A-MSDU, A-MPDU combines multiple protocol data units into a single frame, improving efficiency and reducing overhead.
4. MTBA (Minimum Transmit Beamforming Antennas): By using beamforming technology, the HT radio can focus the transmission on the intended receiver, increasing the signal strength and improving throughput.Rate this question:
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- 47.
Transmit beamforming uses what type of frames to analyze the MIMO channel before transmitting directed paths of data?
- A.
Action frames
- B.
. Trigger frames
- C.
Beaming frames
- D.
Sounding frames
- E.
SM power save action frames
Correct Answer
D. Sounding framesExplanation
Sounding frames are used in transmit beamforming to analyze the MIMO channel before transmitting directed paths of data. These frames help in determining the channel characteristics, such as signal strength and interference, which are crucial for optimizing the beamforming process. By analyzing the MIMO channel using sounding frames, the transmitter can adjust the beamforming parameters and direct the data along the most favorable paths, improving the overall transmission performance.Rate this question:
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- 48.
A 3×4 MIMO radio transmits how many spatial streams of unique data?
- A.
. Three
- B.
. Four.
- C.
Three equal and four unequal streams.
- D.
None—the streams are not unique data.
Correct Answer
A. . ThreeExplanation
The correct answer is three because in a 3x4 MIMO radio, there are three transmit antennas and four receive antennas. Each transmit antenna can send one spatial stream of unique data, so there are a total of three spatial streams of unique data being transmitted.Rate this question:
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- 49.
Name a capability not defined for A-MPDU.
- A.
Multiple QoS access categories
- B.
. Independent data payload encryption
- C.
. Individual MPDUs have the same receiver address
- D.
MPDU aggregation
Correct Answer
A. Multiple QoS access categories -
- 50.
) Which HT protection modes allow only for the association of HT stations in the HT basic service set? (Choose three that apply.)
- A.
Mode 0—Greenfield mode
- B.
Mode 1—HT nonmember protection mode
- C.
. Mode 2—HT 20 MHz protection mode
- D.
Mode 3—HT Mixed mode
Correct Answer(s)
A. Mode 0—Greenfield mode
B. Mode 1—HT nonmember protection mode
C. . Mode 2—HT 20 MHz protection modeExplanation
The three HT protection modes that allow only for the association of HT stations in the HT basic service set are Mode 0—Greenfield mode, Mode 1—HT nonmember protection mode, and Mode 2—HT 20 MHz protection mode. These modes restrict the association of HT stations to only those that are compatible with the HT basic service set, ensuring compatibility and optimal performance within the network.Rate this question:
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Wireless Network Test Ch #vi:Radio communication Basics
Wireless Network Test Ch #vi:Radio communication Basics
Wireless - Topic 2 Controller Discovery and Association
Wireless - Topic 2 Controller Discovery and Association
Wireless Topic 5 - Migrating Standalone APs to LWAPP's
Wireless Topic 5 - Migrating Standalone APs to LWAPP's
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