400-007 · Question #82
An existing wireless network was designed to support data traffic only. You must now install context Aware services for location tracking changes must be applied to the existing wireless network to…
The correct answer is A. Add access points along the perimeter of the coverage area. D. Install additional access points in monitor mode where the co-channel interference would. 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.
Question
An existing wireless network was designed to support data traffic only. You must now install context Aware services for location tracking changes must be applied to the existing wireless network to increase the location accuracy? (Chose two)
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
How the community answered
(19 responses)- A84% (16)
- B11% (2)
- C5% (1)
Why each option
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.
Adding APs along the perimeter of the coverage area ensures that clients near the edges are heard by multiple APs at varying angles and distances, which is essential for accurate RF-based triangulation used by the Cisco Mobility Services Engine.
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.
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.
Installing additional APs in monitor mode allows them to passively listen on all channels simultaneously and report client RSSI data to the MSE without associating clients or contributing co-channel interference, directly improving location calculation accuracy.
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
Source: 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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