CWNP CWISA-102 Exam Dumps

SINR vs. SNR:

SNR (Signal-to-Noise Ratio):Measures the power of the desired signal relative to background noise.

SINR (Signal-to-Interference-plus-Noise Ratio):Considers both background noiseandinterference from other signals operating on the same frequency.

Practical Importance:SINR is a more realistic indicator of real-world signal quality in wireless environments where interference is a significant factor.

References

SINR:https://en.wikipedia.org/wiki/Signal-to-interference-plus-noise_ratio

SNR:https://en.wikipedia.org/wiki/Signal-to-noise_ratio

Lab Purpose:Wireless testing labs offer controlled settings to:

Skill Development:Hone practical understanding of wireless technologies without impacting production environments.

Experimentation:Safely test different configurations, compatibility, and potential issues.

Troubleshooting:Isolate problems, test solutions, and understand how equipment behaves in various scenarios.

Other Benefits (While not the primary benefit):

Learning Environment:Ideal for structured training and exploration.

Evaluation:Compare hardware performance before deployment.

References

Benefits of IT Labs:Can be extended from wireless to broader IT experimentation and learning. (Articles on this topic are readily available)

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.

Cloud Connectivity Relies on IP:Most cloud-based services operate via the internet, which utilizes Internet Protocol (IP) at Layer 3 of the network model.

Flexibility:Various Layer 2 technologies (Ethernet, Wi-Fi) can connect to a Layer 3 network that ultimately provides Internet access

BLE Exception:Bluetooth Low Energycanhave cloud connectivity, but often through gateways and not as a direct Layer 2 connection.

Eliminating Incorrect Options:IPX/SPX is an outdated protocol, and cellular is only one possible way to achieve Internet access.

References:

OSI Model:Descriptions of Network Layers, especially Layer 2 (Data Link) and Layer 3 (Network).

Cloud Architecture:Diagrams showing how devices commonly access cloud resources through internet-based infrastructures.

Requirements Drive Decisions:The decision between wired or wireless must align with the solution's overall purpose, performance targets, and operational constraints.

Key Considerations:

Reliability:Does the application require guaranteed connectivity? (Wired may be favored).

Installation Cost:Can extensive cabling be done, or is it prohibitively expensive? (Wireless may be favored).

Flexibility and Scalability:Is node placement likely to change in the future? (Wireless may be favored).

Other Factors are Important, But Secondary:Distance, PoE availability, specific applications all matter, but they are assessedwithin the contextof the overarching business needs.

References:

Wireless vs. Wired Network Design:Comparisons of pros and cons, highlighting how use cases guide the choice.

IoT Solution Planning:Materials on defining requirementsbeforeselecting technology.