350-401 Architecture Practice Question
Which THREE of the following are valid considerations when planning a wireless network for high-density environments?
⚠ Common exam trap
Cisco often tests the misconception that increasing AP transmit power always improves coverage and performance, when in fact, in high-density environments, lowering power and reducing cell size is the correct strategy to increase capacity and minimize interference.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a channel reuse plan that minimizes co-channel interference.
A channel reuse plan that minimizes co-channel interference is essential in high-density environments to ensure that adjacent access points (APs) do not use the same or overlapping channels, which would degrade throughput. By carefully planning channel assignments (e.g., using non-overlapping channels in the 5 GHz band), you maximize spatial reuse and overall network capacity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a channel reuse plan that minimizes co-channel interference.
Why this is correct
In a high-density wireless design, co-channel interference is the primary limiting factor because all APs on the same channel share the medium. A channel reuse plan ensures that APs operating on the same non-overlapping channel are separated by enough physical distance, often using different channels for adjacent cells. This spatial reuse maximizes aggregate throughput by allowing more simultaneous transmissions.
- ✓
Prefer the 5 GHz band over 2.4 GHz for client connectivity.
Why this is correct
The 5 GHz band provides a large pool of non-overlapping channels—up to 25 with 20 MHz width in many regulatory domains—whereas 2.4 GHz offers only three. Additionally, the 2.4 GHz spectrum suffers from heavy congestion from non-Wi-Fi devices like Bluetooth, cordless phones, and microwave ovens, making it nearly impossible to achieve reliable high-capacity connectivity. Offloading clients to 5 GHz reduces contention and preserves the scarce 2.4 GHz resources for legacy or IoT devices.
- ✓
Lower AP transmit power to reduce cell size and increase capacity.
Why this is correct
Reducing AP transmit power shrinks the RF cell radius, enabling a higher density of APs to be deployed in the same area without causing pairwise co-channel interference. Smaller cells inherently increase spatial reuse, as each AP serves fewer clients and the channel is reused more frequently across the environment. This is a standard technique in high-density venues like stadiums and auditoriums to increase aggregate capacity.
- ✗
Increase AP transmit power to maximize coverage.
Why it's wrong here
Raising transmit power to cover a wider area increases cell size and, critically, the number of clients contending for each channel. This excessive overlap creates more co-channel interference, degrades throughput, and causes hidden-node problems, particularly in dense deployments. In modern Wi-Fi design, coverage range is rarely the bottleneck; instead, capacity and interference management drive the design, so increasing power is counterproductive.
- ✗
Enable 2.4 GHz band only to maximize range.
Why it's wrong here
While 2.4 GHz does propagate farther and penetrates obstacles better, enabling it as the only band to maximize range creates a severe capacity bottleneck. The band offers only three non-overlapping channels, so in any multi-AP deployment, co-channel interference becomes unavoidable, and external interference from Bluetooth and other devices compounds the problem. This approach sacrifices the entire 5 GHz capacity and is therefore not a valid consideration for high-density design.
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Written by Johnson Ajibi, MSc IT Security
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