In which three network technologies is traffic shaping used to prevent and manage congestion？ （）

单项选择题Whatbestdescribesprocessingdelay？（）

A.the time required from receipt of the incoming frame， until the frame/packet has been queued for transmission
B.the time taken for a single packet to traverse the physical medium from one end to the other
C.the time taken to place a frame on the physical medium for transport
D.the time spent for a packet to reside in the output queue of a router

单项选择题WhichQoSmodelmanagestheQoSrequirementsforthenetworkonaper-hopbehavior（PHB）basis？（）

A.best-effort delivery
B.ingress committed rate （ICR）
C.shaping and policing
D.egress committed rate （ECR）
E.Integrated Services （IntServ）
F.differentiated services （DiffServ）

单项选择题Refer to the exhibit. The auto discovery qos command was configured on this interface 24 hours prior to the above configuration. Which statement is true about the configuration?（）

A. An IP address is needed on interface seriall/2.
B.The auto discovery qos command should be configured on the subinterface
C.A generated AutoOoS policy has been applied to serial1/2.
D.The collection of data has stopped.

单项选择题Identifythelinkefficiencymechanism？（）

A.LFI
B.LLQ
C.RSVP
D.WFO
E.WRED

单项选择题Toprovidequalityofservice（QoS）forvoicetrafficinanIEEE802.1qnetwork，whichclassofservice（CoS）valueshouldbeusedinthe3-bit，userprioritybits（PRI）field？（）

A.The PRI field should contain the Cos value of 010
B.The PRI field should contain the Cos value of 011
C.The PRI field should contain the Cos value of 100
D.The PRI field should contain the Cos value of 101
E.The PRI field should contain the Cos value of 110
F.The PRI field should contain the CoS value of 111