CWISA-103 시험 - CWNP실제시험문제와 답 - 67문항

Question No : 1

Which one of the following location tracking technologies is most energy efficient in typical implementations?

A.BLE Beacons
B.Cellular
C.GPS
D.Wi-Fi

정답:
Explanation:
BLE Beacon Power Efficiency: Bluetooth Low Energy (BLE) beacons are designed for low power consumption. Their primary function is to periodically broadcast short data packets (advertising their presence).
Other Technologies:
Cellular: More power-hungry due to long-range communication and complex protocols.
GPS: Power intensive, especially when actively tracking location.
Wi-Fi:

Question No : 2

In the simplified three-layer model for wireless IoT, what is the universal primary function of the Perception layer?

A.Gathering and transmitting data to be used for actions, analysis or reporting
B.Analyzing data for actions and reporting using AI and ML
C.Decrypting local data to send across the unencrypted IoT network
D.Providing the network across which data can be transmitted to the cloud

정답:
Explanation:
Perception Layer: The foundation of an IoT system, it consists of sensors and actuators that:
Sense: Collect data about the environment or object being monitored.
Actuate: Potentially make changes based on commands (e.g., a smart valve opening/closing).
Transmit: Send gathered data to upper layers for processing.

Question No : 3

A Wi-Fi enabled weight scale is an example of what kind of health IoT device?

A.implantable
B.wearable
C.non-wearable
D.injectable

정답:
Explanation:
Health IoT Device Categories:
Wearable: Devices worn on the body (smartwatches, fitness trackers).
Non-wearable: Devices used without being worn (smart scales, connected medical equipment).
Implantable: Surgically inserted devices (pacemakers, glucose monitors).
Reference
Health IoT: Resources on healthcare + IoT will illustrate device types.

Question No : 4

What is a common characteristic of Industrial IoT (IIoT) devices that is not a characteristic of all IoT devices?

A.Ruggedized devices constructed for operating in harsh environments
B.Use of standardized protocols
C.Transmission of small amounts of data throughout the day
D.Use of proprietary protocols

정답:
Explanation:
IIoT Environments: Industrial IoT (IIoT) often involves deployment in harsh environments (factories, plants, outdoor sites) with:
Extreme temperatures
Dust & Vibrations
Exposure to chemicals or moisture
Ruggedization: IIoT devices are designed to withstand these conditions, ensuring reliability and longevity.
Reference
IIoT: https://en.wikipedia.org/wiki/Industrial_Internet_of_things
Rugged Devices: Articles on ruggedized electronics will emphasize their importance in industrial settings.

Question No : 5

What kind of PoE device can be used to power a non-PoE connected object assuming PoE power is provided on the Ethernet cable?

A.PoE midspan injector
B.PoE endspan switch
C.PoE coupler
D.PoE splitter

정답:
Explanation:
PoE Splitter: A PoE splitter separates power and data from a PoE-enabled Ethernet cable, allowing the powering of non-PoE devices.
Other PoE Devices:
PoE Injector: Adds power to non-PoE Ethernet cable.
PoE Switch: Provides power directly through its ports.

Question No : 6

What is most often used to track livestock on large farms and identify each animal Individually?

A.Photodiode sensors
B.RFID tags
C.802.11 wireless radios
D.Thermistor sensors

정답:
Explanation:
RFID for Livestock: Radio Frequency Identification (RFID) tags are the most widely used technology for livestock tracking and individual identification on large farms.
Benefits:
Unique ID: Each RFID tag has a unique code.
Data Storage: Some tags store information about the animal.
Durability: Tags withstand outdoor conditions.
Automated Reading: Tags can be scanned quickly.
Reference
RFID (General): https://en.wikipedia.org/wiki/Radio-frequency_identification

Question No : 7

You are implementing a smart office wireless solution for a small business. The business owner indicates that It is acceptable to use consumer-targeted wireless devices.
What is a common negative attribute of consumer-targeted smart home or smart office devices?

A.They rarely support features required for small business deployment
B.They often operate only in the 2.4 GHz frequency band used by 802.11 devices
C.They typically only support FHSS modulation schemes
D.They usually stop working after twelve months

정답:
Explanation:
Consumer Smart Devices Limitation: Many consumer-oriented smart devices are designed for simplicity and cost-effectiveness, leading to reliance on the crowded 2.4 GHz band.
Consequences:
High Interference: Increased potential for interference from Wi-Fi and other 2.4 GHz devices.
Limited scalability: Performance and reliability may degrade in busy wireless environments.

Question No : 8

As an RF signal propagates it becomes weaker at any given measurement point as it gets farther away from the transmitter.
What concept is described?

A.RF latency
B.Free Space Path Loss
C.Beamwidth
D.Diffraction

정답:
Explanation:
Free Space Path Loss (FSPL): Describes how a radio signal weakens as it travels through open space, even without obstacles. It's caused by the signal spreading out, resulting in decreased power density at the receiver.
Calculation: FSPL depends on distance and frequency.
Reference
Free Space Path Loss: https://en.wikipedia.org/wiki/Free-space_path_loss

Question No : 9

What metric is used to express a relative increase or decrease in signal strength?

A.W
B.dBm
C.dB
D.mW

정답:
Explanation:
Decibel (dB): A logarithmic unit expressing ratios of power or signal strength. It's used in RF contexts due to the wide range of signal levels encountered.
Examples:
dBm: Decibels relative to one milliwatt (power measurement).
dBi: Decibels relative to an isotropic antenna (antenna gain).
Reference
Decibel: https://en.wikipedia.org/wiki/Decibel

Question No : 10

How does OFDMA differ from OFDM?

A.Subcarriers of OFDMA can contain data destined for a different receiver
B.OFDMA offers greater range by using multiple channels at once
C.OFDMA allows multiple devices to transmit simultaneously on the same frequency
D.OFDMA uses multiple radios to achieve higher throughput

정답:
Explanation:
OFDM vs. OFDMA:
OFDM (Orthogonal Frequency-Division Multiplexing): Divides a channel into multiple subcarriers for data transmission.
OFDMA (Orthogonal Frequency-Division Multiple Access): Extends OFDM by allowing multiple users to share subcarriers simultaneously, improving efficiency and spectral utilization.
Reference
OFDM: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing
OFDMA: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_access

Question No : 11

What primary component is required to implement a wireless transceiver in a device?

A.GPIO pins
B.SRAM
C.Flash memory
D.Radio

정답:
Explanation:
Wireless Transceiver: A transceiver is a combination of a transmitter and receiver used for wireless communication.
Radio: The radio is the primary component responsible for:
Modulation: Encoding data onto a carrier wave.
Demodulation: Extracting data from a received signal.
Transmission/Reception: Handling the actual sending and receiving of modulated signals over the air.
Reference
Transceiver: https://en.wikipedia.org/wiki/Transceiver

Question No : 12

What modulation is used by LoRa?

A.OFDMA
B.CSS
C.ASK
D.OFDM

정답:
Explanation:
LoRa Modulation: LoRa (Long Range) is a proprietary wireless technology that utilizes Chirp Spread Spectrum (CSS) modulation.
CSS Characteristics:
Spread spectrum technique for resilience against interference.
Chirps (frequency sweeps) enable operation below the noise floor for long range.
Reference
LoRa: https://en.wikipedia.org/wiki/LoRa
Chirp Spread Spectrum (CSS): https://en.wikipedia.org/wiki/Chirp_spread_spectrum

Question No : 13

What does the number in the various Quadrature Amplitude Modulation levels, such as 16 in QAM-16 and 64 in QAM-64, indicate? (Choose the single best answer.)

A.The speed of data transfer, which is four times the number in the QAM level
B.The channel width, which is stipulated in MHz
C.The number of target points in the QAM constellation, which are equivalent to amplitude and phase combinations
D.The number of spatial streams, which is 1/4 the number in the QAM level

정답:
Explanation:
QAM Constellations: QAM (Quadrature Amplitude Modulation) uses a constellation diagram where points represent unique combinations of amplitude and phase.
Bits per Symbol: The number in QAM-XX indicates the number of points:
QAM-16: 16 points = 2^4 = 4 bits per symbol
QAM-64: 64 points = 2^6 = 6 bits per symbol
Higher Data Rates: More points in the constellation enable transmitting more bits per symbol, leading to higher data rates at the same bandwidth.
Reference
QAM: https://en.wikipedia.org/wiki/Quadrature_amplitude_modulation

Question No : 14

How is ASK modulation different from FSK modulation?

A.ASK varies the amplitude of the signal while FSK shifts its frequency
B.FSK is more sensitive to noise than ASK
C.ASK does not work at high frequencies
D.ASK can carry more data than FSK

정답:
Explanation:
Key Modulation Differences:
ASK (Amplitude Shift Keying): Digital data is represented by changes in the amplitude (strength) of a carrier wave.
FSK (Frequency Shift Keying): Digital data is represented by changes in the frequency of a carrier
wave.
Reference
ASK: https://en.wikipedia.org/wiki/Amplitude-shift_keying
FSK: https://en.wikipedia.org/wiki/Frequency-shift_keying

Question No : 15

What is defined as the weakening of signal amplitude as the signal passes through a medium?

A.Diffraction
B.Reflection
C.Attenuation
D.Scattering

정답:
Explanation:
Attenuation: Describes the progressive loss of signal strength as it travels through a medium (like air, cables, walls). It's caused by factors like absorption, distance, and obstacles.
Other Phenomena:
Diffraction: Bending of waves around obstacles.
Reflection: Waves bouncing off surfaces.
**Scattering: ** Waves dispersing in multiple directions.
Reference
Attenuation: https://en.wikipedia.org/wiki/Attenuation

CWNP CWISA-103 시험