How to Reduce Network Congestion and Improve Performance?
Short answer
C Quality of service
Question
Key Takeaways
Tests whether you know that load balancing distributes traffic to eliminate bottlenecks, while QoS only prioritizes flows without reducing actual congestion.
Learn to differentiate between load balancing and Quality of Service when addressing switch congestion. Official objectives and community consensus confirm load balancing is required to actively reduce traffic bottlenecks and packet loss.
Common mistake: Candidates often choose Quality of Service (C) because it improves perceived performance, but QoS cannot decrease total traffic volume or resolve physical/logical congestion, leading to continued packet loss.
Expert Analysis
Why the Answer Is Correct
Load balancing distributes network traffic across multiple paths or switch ports, preventing any single link from becoming overwhelmed during peak hours. By evenly spreading the data flow, it directly reduces congestion, minimizes packet loss, and lowers latency. CompTIA consistently associates active congestion reduction with traffic distribution mechanisms rather than prioritization tools.
Why the Other Options Are Wrong
Quality of Service (C) classifies and prioritizes traffic but does not increase available bandwidth or reduce the total volume of packets, leaving congestion intact. Port mirroring (B) is exclusively used for traffic capture and troubleshooting, offering zero performance benefits. Spanning Tree Protocol (D) prevents Layer 2 switching loops and can temporarily halt forwarding during reconvergence, which would worsen latency rather than solve it.
Community Comment Notes
The voting split highlights a classic exam trap where candidates confuse traffic management strategies. As noted in top-rated comments, load balancing actively redistributes traffic to clear bottlenecks, whereas QoS merely organizes existing traffic under pressure. This distinction confirms that A is the only option that fulfills the requirement to "reduce congestion."
Official Reference
https://learning.comptia.org/certifications/network+
This link opens the official vendor documentation in a new tab.
Exam Strategy
Always align your answer with the exact verb in the question: "reduce congestion" requires capacity expansion or traffic distribution (load balancing), while "prioritize traffic" points to QoS. Quickly eliminate monitoring and loop-prevention protocols to narrow your focus to traffic engineering concepts.
Community Votes
50% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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2a45295 👍 3 Answered AThis could be A or C but I it's looking for A. Quality of Service and Load balancing can both work to decongest an environment, load balancing by disrupting traffic and QoS by assigning priority to traffic in order to organize it.
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Jeckmc 👍 2 Answered CThe network is experiencing high latency and packet loss during peak hours, which suggests network congestion. The best solution is to prioritize critical traffic using Quality of Service (QoS).
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Ray03192 👍 1 Answered CcAUSE the boys said so
Reader comments & corrections
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