QoS stands for Quality of Service. You’ll generally only find QoS on high end routers.
QoS enables busy networks to prioritize traffic. You can prioritize based on MAC address, IP address, port number, or application.
For example, you can specify that your SOHO work desktop has a higher priority than the personal laptop just used for streaming videos.
• Configured on the Advanced tab of the NIC’s Properties dialog box
Windows has a feature called Differentiated Services Code Points (DSCP) which is a type of QoS. DSCP fields are in an IP header. The network administrator can then assign different priorities to different types of traffic.
The system administrator can assign different priorities through Local Computer Policy or Group Policy (in a domain). In either one, you’d configure the QoS by going into Computer Configuration > Windows Settings > Policy-based QoS.