400-007 Question #82: Real Exam Question with Answer & Explanation

Question

Options

• AAdd access points along the perimeter of the coverage area.
• BIncrease the access point density to create an average inter-access point distance of less than 40
• CUse directional antennas to provide more cell overlapping
• DInstall additional access points in monitor mode where the co-channel interference would
• EFine tune the radio configuration of the access point to have a higher average transmission power

Explanation

Improving Cisco Context Aware Services location accuracy requires both perimeter AP coverage and dedicated monitor-mode APs to maximize RSSI triangulation data without adding co-channel interference.

Common mistakes.

• B. A 40-foot inter-AP distance targets high-density data throughput coverage, not the specific multilateration geometry required for location accuracy, which depends more on perimeter and monitor-mode AP placement.
• C. Directional antennas reduce cell overlap and narrow the RF pattern, which degrades location accuracy because the MSE requires overlapping RSSI readings from multiple APs to calculate a position.
• E. Increasing AP transmission power actually reduces location accuracy by causing fewer APs to report meaningfully differentiated RSSI values for a given client, flattening the signal gradient used for triangulation.

Concept tested. Cisco Context Aware Services location accuracy design

Reference. https://www.cisco.com/c/en/us/td/docs/wireless/mse/3350/7-3/CAS_Configuration_Guide/Guide/CAS_73.html

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