N10-009 Question #235: Real Exam Question with Answer & Explanation

Question

A network engineer is troubleshooting an issue with a VoIP network. After performing analysis, the engineer found that when users upload large files, voice quality is severely degraded. When no other traffic is on the network, voice quality is fine. Which of the following should the engineer do to most likely resolve the issue?

Options

• AEnable MAC filtering.
• BReduce the VLAN database.
• CConfigure QoS on the router.
• DImplement ACLs.

Explanation

To resolve VoIP degradation during large file uploads, the engineer should configure Quality of Service (QoS) on the router to prioritize latency-sensitive voice traffic over less time-critical data transfers.

Common mistakes.

• A. Enabling MAC filtering controls which devices can connect to the network based on their MAC address; it does not manage or prioritize traffic flow to prevent congestion and improve VoIP quality.
• B. Reducing the VLAN database is not a standard or effective method for resolving network congestion issues that impact voice quality; VLANs segment networks, but this action does not prioritize traffic.
• D. Implementing ACLs (Access Control Lists) are used for filtering or blocking specific traffic based on source/destination, port, etc., but they do not prioritize traffic to ensure quality of service for applications like VoIP.

Concept tested. Quality of Service (QoS) for VoIP

Reference. https://learn.microsoft.com/en-us/windows-server/networking/technologies/qos/qos-policy-overview

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