Designing a WLAN Network for Voice and Context-Aware Services | CCIE Wireless Written Exam

Design Principles for WLAN Networks Supporting Voice and Context-Aware Services

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Question

When designing a WLAN network to support both voice and context-aware services, which set of design principles should you follow?

Answers

A. An AP must be placed at the perimeter and in each of the four corners of the floor. All APs must be enabled to ensure proper coverage on the floor to provide - 67 dBm, 20 percent celloverlap, and 19 dB channel separation.

B. An AP must be placed at the perimeter and in each of the four corners of the floor. Some APs may be disabled to ensure proper coverage on the floor to provide -67 dBm, 20 percent celloverlap, and 19 dB channel separation.

C. An AP must be placed at the perimeter and in each of the four corners of the floor to ensure proper coverage on the floor to provide -67 dBm, 20 percent cell overlap, and 19 dB channel separation. Some APs may be in monitor mode.

D. If a conflict occurs between the AP placement for voice design and for context-aware location design, then the voice design should take precedence, to protect against delays and dropping of sensitive voice traffic.

E. In a design that includes both voice and context-aware services, voice design always requires more APs to be deployed to ensure -67 dBm coverage, 20 percent cell overlap, 19 dB channel separation, and proper capacity planning.

F. In a design that includes both voice and context-aware services, voice design should take precedence to avoid co-channel interference, which can negatively.

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Explanations

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A. B. C. D. E. F.

The correct answer to this question is D: "If a conflict occurs between the AP placement for voice design and for context-aware location design, then the voice design should take precedence, to protect against delays and dropping of sensitive voice traffic."

When designing a WLAN network to support both voice and context-aware services, several design principles should be followed:

Prioritize Voice Design: Voice traffic is very sensitive to delays and jitter, so it is important to prioritize voice design when there is a conflict between voice and location design.
Use a Balanced Approach: While voice design is critical, it is also important to consider the needs of context-aware services, such as location-based tracking or presence detection.
Optimize for Coverage: In order to support both voice and context-aware services, it is important to ensure adequate wireless coverage with proper cell overlap and channel separation.
Capacity Planning: It is also important to ensure adequate capacity planning to support the number of devices and applications on the network.

Option A is incorrect because it suggests deploying APs in specific locations without considering the needs of both voice and location services.

Option B is incorrect because disabling APs can cause coverage gaps and affect the performance of both voice and location services.

Option C is incorrect because deploying some APs in monitor mode can affect coverage and capacity planning.

Option E is incorrect because deploying more APs does not necessarily mean better coverage or capacity, and it does not consider the needs of location services.

Option F is incorrect because it suggests prioritizing voice design without considering the needs of location services.

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