Which of the following can be used to prioritize network streams to optimize performance for certain traffic types?

VLANs segment a network into logical groups for isolation and management, not for prioritizing traffic performance.

VPNs create encrypted tunnels for secure remote access but do not prioritize or manage traffic quality.

QoS allows administrators to assign priority levels to different traffic types, such as VoIP, video conferencing, or critical business applications, ensuring those streams receive preferential bandwidth and lower latency. It uses mechanisms like DSCP markings or traffic shaping to enforce these policies across network devices.

PoE delivers electrical power over Ethernet cabling to devices like IP phones and access points but has no role in traffic prioritization.