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Free CWISA-102 Exam Braindumps (page: 6)

Page 5 of 18
PDF with 67 Questions

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

  1. W
  2. dBm
  3. dB
  4. mW

Answer(s): C

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



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?

  1. RF latency
  2. Free Space Path Loss
  3. Beamwidth
  4. Diffraction

Answer(s): B

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



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?

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

Answer(s): B

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.



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

  1. Photodiode sensors
  2. RFID tags
  3. 802.11 wireless radios
  4. Thermistor sensors

Answer(s): B

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






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