Quality of Service
Windows Vista's networking stack includes integrated policy-based Quality of Service (QoS) functionality to prioritize network traffic. Quality of Service can be used to manage network usage by specific applications or users, by throttling the bandwidth available to them, or it can be used to limit bandwidth usage by other applications when high priority applications, such as real time conferencing applications, are being run, to ensure they get the bandwidth they need. Traffic throttling can also be used to prevent large data transfer operations from using up all the available bandwidth. QoS policies can be confined by application executable name, folder path, source and destination IPv4 or IPv6 addresses, source and destination TCP or UDP ports or a range of ports. In Windows Vista, QoS policies can be applied to any application at the Network Layer, thus eliminating the need to rewrite applications using QoS APIs to be QoS-aware. QoS policies can either be set on a per-machine basis or set by Active Directory Group policy objects which ensures that all Windows Vista clients connected to the Active Directory container (a domain, a site or an organizational unit) will enforce the policy settings.
Windows Vista supports the Wireless Multimedia (WMM) profile classes for QoS in wireless networks as certified by the Wi-Fi Alliance: BG (for background data), BE (for Best Effort non real time data), VI (for real time videos) and VO (for real time voice data). When both the wireless access point as well as the wireless NIC supports the WMM profiles, Windows Vista can provide preferential treatment to the data sent.
Read more about this topic: Windows Vista Networking Technologies
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