# Quality of Service (QoS) Tagging for Microsoft* Windows Server*

QoS allows the adapter to send and receive IEEE 802.3ac tagged frames. 802.3ac tagged frames include 802.1p priority-tagged frames and 802.1Q VLAN-tagged frames. In order to implement QoS, the adapter must be connected to a switch that supports and is configured for QoS. Priority-tagged frames allow programs that deal with real-time events to make the most efficient use of network bandwidth. High priority packets are processed before lower priority packets.

To implement QoS, the adapter must be connected to a switch that supports and is configured for 802.1p QoS.

Tagging is enabled and disabled using the "QoS Packet Tagging" field in the Advanced tab in Intel® PROSet.

Once QoS is enabled in Intel PROSet, you can specify levels of priority based on IEEE 802.1p/802.1Q frame tagging.

Microsoft* Windows* Server* has a utility for 802.1p packet prioritization. For more information, see the Windows system help and Microsoft's knowledge base.