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A.to provide policy based routing
B.to provide class of service capabilities
C.to provide firewall filtering capabilities
D.to provide unified threat managment

A.When a single device is configured to provide differentiated services.
B.When multiple devices in a network are configured to use CoS to provide differentiated services.
C.When a device is used to connect to another autonomous system.
D.When CoS is used to classifiy traffic as low priority.