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…

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.

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.

When VoIP quality degrades due to large file uploads, it indicates network congestion where latency-sensitive voice traffic competes for bandwidth with bulk data transfers. Configuring Quality of Service (QoS) on the router allows the network to prioritize VoIP packets, ensuring they receive preferential treatment and sufficient bandwidth, thereby maintaining voice quality even under heavy network load.

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.