A network architect is designing a wireless infrastructure across a multi-floor hospital w… — CompTIA Network+

A network architect is designing a wireless infrastructure across a multi-floor hospital wing to support real-time telemetry equipment and high-definition video consultations. To maximize throughput, an initial plan suggested configuring all $5\text{ GHz}$ access points (APs) to use $80\text{ MHz}$ channel bonding. However, a post-installation spectral analysis reveals high levels of co-channel interference (CCI) due to floor-to-floor signal bleed and limited available spectrum. Which of the following channel management adjustments is the most effective design strategy to mitigate CCI while maintaining reliable wireless performance?

Reduce channel widths to $20\text{ MHz}$ or $40\text{ MHz}$ to expand the pool of available non-overlapping channels across UNII bands.Answer
B
Migrate all $80\text{ MHz}$ bonded channels exclusively to the $2.4\text{ GHz}$ spectrum to take advantage of superior signal attenuation through walls.
C
Consolidate all APs onto a single $80\text{ MHz}$ channel and raise transmission power to maximum to override adjacent cell noise.
D
Configure static channel assignments using channels 1, 6, and 11 within the $5\text{ GHz}$ spectrum to align with international regulatory standards.

Answer

Reduce channel widths to

20\text{ MHz}

40\text{ MHz}

to expand the pool of available non-overlapping channels across UNII bands.

In enterprise wireless deployments, wider bonded channels (

80\text{ MHz}

) aggregate multiple adjacent

20\text{ MHz}

channels. This reduces the number of unique channel selections available, forcing neighboring access points to share frequencies and causing severe co-channel interference (CCI). Reducing the channel width to

20\text{ MHz}

40\text{ MHz}

provides a larger set of non-overlapping channels in the

5\text{ GHz}

UNII bands, allowing effective frequency reuse plans that isolate coverage cells.

Step-by-Step Solution

Analyze the cause of co-channel interference in high-density

5\text{ GHz}

deployments.

Wide channel bonding (

80\text{ MHz}

160\text{ MHz}

) consumes multiple

20\text{ MHz}

sub-channels, drastically reducing the total number of independent channel assignments available.

When distinct APs in physical proximity (including vertical bleed across floors) share the same primary or secondary channels, they create a single contention domain.

Evaluate channel width adjustment vs throughput trade-offs.

Narrowing channel widths to

20\text{ MHz}

40\text{ MHz}

increases the quantity of reusable, non-overlapping channels across UNII-1, UNII-2 (DFS), and UNII-3 spectrum.

More discrete channels enable a spatial channel reuse plan where adjacent and multi-floor coverage cells operate on non-interfering frequencies.

Select the correct mitigation strategy.

Reducing channel bonding width successfully eliminates co-channel interference and medium contention, ensuring stable performance for critical medical applications.

Channel availability and low contention take precedence over maximum theoretical single-client channel width in high-density enterprise environments.

Key Concept

Wireless Channel Width and Co-Channel Interference (CCI) Management

Estimated Time:1m 30s

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