CWNP CWISA-102 Certified Wireless IoT Solutions Administrator Exam CWISA Exam Practice Test
Page: 1 / 14 Total 67 questions
Want more questions? Get Premium Access. ()
Question 1
As an RF signal propagates it becomes weaker as it gets farther away from the transmitter. What concept is described?
Answer : A
The concept described isFree Space Path Loss (FSPL). FSPL refers to the reduction in power density of an electromagnetic wave as it propagates through a clear, unobstructed path in free space. This weakening of the signal is due to the spreading of the wavefront as it travels, causing the power to be distributed over a larger area. The FSPL can be calculated using the Friis Transmission Equation, which shows that the received power decreases with the square of the distance from the transmitter. This concept is fundamental to understanding the behavior of RF signals in various communication systems, including wireless IoT, where the signal strength at the receiver is a critical factor for reliable data transmission.
What consideration is found in PtMP systems that is not found in PtP systems?
Answer : C
PtMP (Point-to-Multipoint):A single access point (AP) communicates with multiple client devices. This means the AP needs to manage how the available airtime is shared among those clients.
Airtime Fairness:Mechanisms are needed to ensure that:
Each client gets a fair chance to communicate
High-priority traffic isn't starved by low-priority traffic
PtP (Point-to-Point):A dedicated link only has two devices, eliminating the need for complex airtime management.
Considerations in Both:While interference, SINR, and frequency selection are important in both PtMP and PtP systems, the need for airtime management is unique to the multipoint scenario.
References:
Wireless Network Topologies (PtP vs. PtMP):References of the differences in how communication is managed in each scenario.
TDMA (Time Division Multiple Access):A common airtime sharing method used in PtMP systems.
Question 3
What factor severely limits the range of systems operating in the 60GHz band?
Answer : D
60GHz Absorption:The 60GHz band experiences significant signal attenuation due to absorption by oxygen molecules in the atmosphere. This severely restricts the usable range of wireless systems operating in this frequency.
Why Other Options Don't Apply:
Atmospheric Scattering:Impacts longer wavelength transmissions, less significant at 60GHz.
Solar Radiation:Can cause interference on some frequencies, but not a primary range limitation at 60GHz.
Rain Fade:Primarily affects higher frequencies (above 10GHz), but its impact is less severe than oxygen absorption at 60GHz.
References:
60GHz Propagation Characteristics:Technical papers discussing oxygen absorption and its influence on range limitations.
Millimeter-wave (mmWave) Communication:Overviews highlighting the challenges and short-range applications of 60GHz systems.
Question 4
Among these choices, what is the most common reason administrators use scripting during the deployment of a wireless solution?
Answer : B
Automation for Consistency:Scripts eliminate the potential for human error during repetitive configuration tasks on multiple devices. This ensures uniformity across the wireless solution.
Speed and Efficiency:Scripts can be much faster than manual configuration, particularly in large deployments.
Other Benefits:While scriptsmightaid signal strength (e.g., optimizing settings) or enhance solution capabilities, their core value in configuration is reducing errors.
References:
Network Automation:Benefits of using scripts for configuration management.
Configuration Management Best Practices:Emphasize the importance of consistency and repeatability.
Question 5
In a wireless link, as the signal strength decreases, what else may decrease?
Answer : D
Signal Strength and Data Rate:In wireless links, weaker signal strength often directly correlates to reduced transmission speeds. Modern wireless technologies use adaptive modulation and coding, sacrificing speed for reliability when signals become weaker.
Noise and Interference:While thesecanimpact performance, they don't inherently decrease simply because signal strength drops.
Latency:Latency can be affected by poor signal, but its primary drivers are distance and network congestion.
References:
Wireless Signal Strength vs. Speed:Articles explaining the relationship and how adaptive modulation works.
Modulation and Coding Schemes (MCS):Technical descriptions of how Wi-Fi and other wireless technologies adjust speeds based on signal quality.
Question 6
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?
Answer : B
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 7
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?
Answer : B
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.
All Official Question Types