Differentiatedservice简称Diffserv。
Differentiatedservice简称Diffserv。
相关考题：
Whatarethethreemodelsofqualityofservice(QoS)inanetwork?() A.ResourceReservationProtocol（RSVP）B.first-in，first-out（FIFO）C.best-effortD.CBWFQE.IntServF.DiffServ
WhichQoSmodelmanagestheQoSrequirementsforthenetworkonaper－hopbehavior(PHB)basis?() A.best-effortdeliveryB.ingresscommittedrate（ICR）C.shapingandpolicingD.egresscommittedrate（ECR）E.IntegratedServices（IntServ）F.differentiatedservices（DiffServ）
Refertothewxhibit.whatQOSmodelshouldbeusedtoreservetherequestedbandwidthanddelayneededforeachallowedVOIPcallregardlessofchangingnetworkconditions?() A.best-effortdeliveryB.ingresscommittedrate（ICR）C.shapingandpolicingD.egresscommittedrate（ECR）E.integratedServices（IntServ）F.differentiatedservices（DiffServ）
以下关于DiffServ的说法，不正确的是（ ）。A.DiffServ最主要的优势是弱化了对信令的依赖B.DiffServ提供全网端到端的QoS保证C.DiffServ将QoS的一致性范围缩小到每个区域之中，从而降低了这种模型实现的复杂性。D.DiffServ无需像IntServ在每个路由器上为每个业务流保留"软状态"，避免了大量的资源预留信息的传递，具有更好的可扩展性
Which two models are the models of DiffServ-Award traffic Engineering？（）A、Class-based ModelB、Maximum Allocation ModelC、Russian Doll ModelD、Global Tunnel ModelE、Policy-based Model
Which three statements are true about the application of QoS models？ （）A、 The DiffServ model requires applications to signal the network with QoS requirements.B、 The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.C、 The DiffServ model requires RSVP.D、 The best effort model is suitable for applications such as file transfer and e-mailE、 The IntServ model requires applications to signal the network with QoS requirements.F、 The IntServ model attempts to deliver a level of service based on the QoS specified by each packet
Which two statements about the DiffServ model are true？（）A、a class can be identified as a single application， multiple applications with similar service needs，or be based on the source or destination IP addressB、a drawback of the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）C、DiffServ uses the DiffServ field in the MAC header to mark frames into behaviorD、the DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS fieldE、the first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） valueF、the primary goal of DiffServ is scalability
What are two characteristics of the DiffServ model？（）A、service guaranteeB、traffic that is divided into classesC、not scalable to large implementationsD、QoS mechanisms that are used without prior signalingE、applications that signal their particular QoS and bandwidth requirements
Which two statements about the DiffServ model are true？ （）A、 A class can be identified as a single application， multiple applications with similar service needs， or be based on the source or destination IP addresses.B、 A drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field.C、 DiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）. D、 The DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field.E、 The first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value.F、 The primary goal of DiffServ is scalability.
Which two statements about the DiffServ QoS model are true？（）A、DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.B、Network traffic is identified by class， and the level of service is chosen for each class.C、The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.D、RSVP enables the DiffServ model to provide end-to-end QoS.E、The DiffServ model is more scalable than the IntServ model.F、The flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.
Which three statements are true about the appliance of QoS models？（）A、the DiffServ model requires applications to signal the network with QoS requirementsB、the DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addressesC、the DiffServ model requires RSVPD、the best effort model is suitable for applications such as file transfer and e-mailE、the IntServ model requires applications to signal the network with QoS requirementsF、the IntServ model model attempts to deliver a level of service based on the QoS specified by each packet
多选题Which two statements about the DiffServ QoS model are true？（）ADiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.BNetwork traffic is identified by class， and the level of service is chosen for each class.CThe DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.DRSVP enables the DiffServ model to provide end-to-end QoS.EThe DiffServ model is more scalable than the IntServ model.FThe flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.
多选题Which two statements about the DiffServ model are true？ （）AA class can be identified as a single application， multiple applications with similar service needs， or be based on the source or destination IP addresses.BA drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field.CDiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）.DThe DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field.EThe first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value.FThe primary goal of DiffServ is scalability.
多选题Which three statements are true about the application of QoS models？ （）AThe DiffServ model requires applications to signal the network with QoS requirements.BThe DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.CThe DiffServ model requires RSVP.DThe best effort model is suitable for applications such as file transfer and e-mailEThe IntServ model requires applications to signal the network with QoS requirements.FThe IntServ model attempts to deliver a level of service based on the QoS specified by each packet
多选题Which three statements are true about the appliance of QoS models？（）Athe DiffServ model requires applications to signal the network with QoS requirementsBthe DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addressesCthe DiffServ model requires RSVPDthe best effort model is suitable for applications such as file transfer and e-mailEthe IntServ model requires applications to signal the network with QoS requirementsFthe IntServ model model attempts to deliver a level of service based on the QoS specified by each packet