QoS policies in Windows Server 2008 and Windows Vista allow IT staff to either prioritize or manage the sending rate for outgoing network traffic. IT staff can confine the settings to specific application names, specific source and destination IP addresses, and specific source and destination TCP or UDP ports. QoS policy settings are part of user configuration or computer configuration Group Policy settings and are configured by using the Group Policy Object Editor. They are linked to Active Directory® Domain Services containers (domains, sites, and organizational units) by using the Group Policy Management Console. To manage the use of bandwidth, QoS policy can be configured with a throttle rate for outbound traffic. By using throttling, a QoS policy can limit the aggregate outbound network traffic to a specified rate. To specify prioritized delivery, traffic is marked with a Differentiated Services Code Point (DSCP) value. The routers or wireless access points in the network infrastructure can place DSCP-marked packets in different queues for differentiated delivery. Both DSCP marking and throttling can be used together to manage traffic effectively. Because the throttling and priority marking are taking place at the network layer, applications do not need to be modified.Using Quality of Service Policies, network administrators can prioritize network traffic from specified users and groups at branch office locations connecting to servers in hub sites. This would take better advantage of available network bandwidth during peak load times, proving faster throughput, a better user experience, and fewer delays, resulting in better overall productivity.
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