Research Methods & Evidence-Based Practice Flashcards

A wireless project team wants to apply evidence-based practice to AP placement decisions. Which sequence of steps BEST represents this methodology?

Answer: Collect pre-deployment RF data, create a predictive model, deploy, validate with post-deployment survey, and document findings

Evidence-based practice requires pre-deployment data collection, modeling, deployment, and post-deployment empirical validation before final documentation.

When analyzing retransmission rates in a protocol capture, what threshold is commonly cited in industry guidance as the point at which retransmissions begin to significantly impair real-time applications?

Answer: 10%

Industry guidance generally considers retransmission rates above 10% as significantly impactful to latency-sensitive real-time applications like voice and video.

A researcher observes that throughput test results vary significantly between morning and afternoon surveys in the same location. What is the FIRST variable to investigate?

Answer: Number of active users and traffic load on the AP during each test window

User load and concurrent traffic directly affect available bandwidth per client, making it the primary variable explaining time-of-day throughput differences.

For evidence-based capacity planning in a 300-seat conference center with dense Wi-Fi 6 deployment, which input data is MOST critical to validate design adequacy?

Answer: Expected simultaneous active sessions, application bandwidth requirements per user, and measured channel utilization under simulated load

Accurate capacity planning requires modeling real application demand per user and validating with load testing, not relying on vendor maximum client counts alone.

Which 802.11 feature, when enabled and verified through protocol analysis, provides evidence that a network actively manages co-channel interference among APs from the same vendor?

Answer: BSS Coloring in 802.11ax

BSS Coloring assigns color bits to BSSs, enabling APs to distinguish overlapping BSS traffic from intra-BSS traffic and reduce unnecessary deferrals.

A wireless network manager wants to implement a continuous monitoring strategy that provides ongoing empirical evidence of network health. Which approach BEST supports this goal?

Answer: Deploy wireless intrusion prevention sensors in monitor mode to collect continuous RF and performance data

Dedicated monitor-mode sensors provide continuous RF and performance data collection, offering real-time empirical evidence rather than periodic point-in-time snapshots.

An engineer compares two AP placements using A/B testing methodology in a retail environment. Which element is MOST essential to ensure the comparison produces valid evidence?

Answer: Testing both placements with the same client devices, traffic load, time of day, and measurement tools simultaneously or under identical conditions

Valid A/B testing requires controlling all variables except the one being tested; identical conditions ensure performance differences are attributable to AP placement alone.