Examkin

Question

Difficulty: HardWireless Network Deployment and Standards

A network consultant is designing a high-density Wi-Fi deployment for a university sports arena housing thousands of concurrent wireless clients. To minimize co-channel interference (CCI), optimize spectrum efficiency, and maintain reliable roaming performance across adjacent access point (AP) cells, which of the following deployment strategies should the consultant implement? (Select TWO.)

  1. Install directional antennas focused downward onto designated seating sections to contain RF coverage cells and reduce cell overlap.Answer
  2. B
    Configure wide 80 MHz80\text{ MHz} channel bonding across all 5 GHz5\text{ GHz} access point radios to maximize theoretical throughput for individual clients.
  3. Utilize Dynamic Frequency Selection (DFS) channels in the 5 GHz5\text{ GHz} band to increase the total number of non-overlapping channels available for AP allocation.Answer
  4. D
    Set 2.4 GHz2.4\text{ GHz} radio transmit power to maximum output across all APs to ensure deep signal penetration through concrete structural elements.
  5. E
    Assign contiguous channels such as Channel 2, Channel 4, and Channel 7 across adjacent 2.4 GHz2.4\text{ GHz} radios to distribute traffic.

Answer

The consultant should install directional antennas focused downward onto designated seating sections to restrict RF coverage cell boundaries and utilize Dynamic Frequency Selection (DFS) channels in the 5 GHz5\text{ GHz} spectrum to expand available non-overlapping channels.
In high-density environments such as sports arenas, containment of RF coverage cells and maximization of available non-overlapping spectrum are critical. Installing directional antennas focuses signal propagation into targeted seating sectors, preventing RF leakage into neighboring AP coverage zones. Additionally, enabling Dynamic Frequency Selection (DFS) allows access points to operate on UNII-2 and UNII-2 Extended spectrum in the 5 GHz5\text{ GHz} band, significantly expanding the pool of available non-overlapping channels needed for dense channel reuse plans.

Step-by-Step Solution

1
Analyze high-density RF interference challenges
Identified co-channel interference (CCI) and channel reuse limits as the primary performance bottlenecks in a crowded stadium environment.
When hundreds of clients connect to nearby APs operating on the same spectrum, overlapping cells degrade throughput and cause contention.
2
Evaluate antenna pattern selection
Selected directional patch/sector antennas over omnidirectional antennas.
Directional antennas shape radiation patterns into narrow beams focused on specific seating sections, physically constraining RF propagation and preventing cell overlap.
3
Evaluate channel planning in the 5 GHz5\text{ GHz} spectrum
Selected DFS channel inclusion while avoiding wide channel bonding (80 MHz80\text{ MHz}).
DFS unlocks additional 5 GHz5\text{ GHz} channels (UNII-2 and UNII-2 Extended), allowing a dense matrix of APs to operate on non-overlapping channels. Wide 80 MHz80\text{ MHz} channels deplete available channels, exacerbating CCI.

Key Concept

High-Density Wireless RF Cell Containment and DFS Spectrum Allocation
Estimated Time:2m 0s
Rate this question

Topics

Wireless Network Deployment and Standards

More questions from this topic