Pass the CWNP CWSA (Solutions Administrator) CWISA-103 Questions and answers with ExamsMirror

Legacy Support: The primary reason to continue using older wireless technologies is the need to connect with devices that don't support newer standards (e.g., old sensors or equipment).

Other Reasons (Not as Strong):

Cost: Replacing legacy devices can be expensive.

Reliability: Some legacy technologies might be well-proven in specific settings.

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 noise and interference 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

Firmware Definition: Firmware is a type of software embedded in hardware devices. It provides low-level instructions that control the basic operations and initialization of the device.

ROM Storage: Firmware is typically stored in Read-Only Memory (ROM) or other forms of non-volatile memory, meaning it persists even when the device is powered off.

Functions:

Booting: Initiates the hardware and loads the operating system.

Hardware Control: Provides an interface between the hardware and the operating system.

BIOS: The firmware on PCs is often referred to as BIOS (Basic Input/Output System).

References

Firmware Explanation: https://en.wikipedia.org/wiki/Firmware

ROM: https://en.wikipedia.org/wiki/Read-only_memory

HTTP's Popularity: HTTP is the foundation of the web, making it widely known and supported. Developers have extensive familiarity with its concepts (methods, headers, status codes, etc.).

REST APIs and Webhooks: These often leverage HTTP for communication, building upon existing knowledge and tools.

Tradeoffs:

Security: HTTP itself is not inherently secure; HTTPS or additional layers address this.

Speed: Protocols optimized for IoT may have lower overhead, but HTTP's simplicity often outweighs minor performance differences.

Wi-Fi and Zigbee Interference: Both can operate in the 2.4 GHz band, leading to potential interference that degrades performance for both networks.

5 GHz Advantages:

Less crowded: Fewer devices operate in the 5 GHz band, reducing interference potential.

Wider Channels: 5 GHz supports wider channels, enabling higher data throughput for Wi-Fi.

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 scripts might aid signal strength (e.g., optimizing settings) or enhance solution capabilities, their core value in configuration is reducing errors.

PHP's Cross-Platform Nature: PHP originated for server-side web development, but also has a command-line interface (CLI) enabling its use for scripts and automation tasks.

Other Options:

Some languages are OS-specific (but less frequent with modern scripting languages) .

Many languages work in web or command line, not both like PHP.

Security by Design: Security should be a fundamental consideration from the initial planning stages of any wireless implementation. This ensures:

Risk Assessment: Identifying potential vulnerabilities early on.

Security Controls: Choosing appropriate encryption, authentication, and access control mechanisms.

Integration: Security measures are seamlessly woven into the system's architecture, not retrofitted later, which can be less effective.

Mesh Connectivity Depends on Signal: Mesh nodes relay data for each other. Weak signal strength between nodes can disrupt connectivity throughout the network.

Troubleshooting Signal Issues: Physically relocating affected nodes can improve their ability to form stable connections with other nodes in the mesh.

Why Other Options May Not Help:

Separate Mesh: Splits the network, not solving the root connectivity issue

Output Power: May help marginally, but significant improvement is typically achieved through repositioning.

Security Settings: Unlikely to cause connectivity issues between properly configured nodes in the same mesh.

isualizing RF Interference: Spectrum analyzers display radio frequencies across a range, showing signal strength and potential interference sources. This is crucial for identifying non-Wi-Fi devices that might be disrupting your wireless solution.

Other Tools Have Limitations:

NMAP: Network mapper, focused on discovering devices, not RF analysis

WinPCAP: Packet capture software, helpful but doesn't directly display the RF spectrum.

Protocol Analyzer: Analyzes network traffic, but won't pinpoint physical layer interference.