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
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
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
参考解析
解析：DiffServ的优点：
DiffServ最主要的优势是弱化了对信令的依赖，无需象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。
DiffServ不要求实现端到端的QoS保证。
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。
DiffServ的缺点：
DiffServ不提供全网端到端的QoS保证，它所提供的QoS只是一种相对的QoS只是不同等级业务流之间的QoS好坏关系，在转发方式上仍然是采用传统IP网的逐跳转发方式。
DiffServ最主要的优势是弱化了对信令的依赖，无需象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。
DiffServ不要求实现端到端的QoS保证。
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。
DiffServ的缺点：
DiffServ不提供全网端到端的QoS保证，它所提供的QoS只是一种相对的QoS只是不同等级业务流之间的QoS好坏关系，在转发方式上仍然是采用传统IP网的逐跳转发方式。
相关考题：
关于Qos 协议的特点，以下说法错误的是（ ）。A.IP 协议中增加CSMA多播协议可以支持多媒体网络应用B.MPLS 标记是一个用于数据分组交换的转发标识符C.RSVP 根据需求在各个交换点预留资源D.DiffServ 根据IP 分组头的服务级别进行标识
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
QoS中通常有以下哪些服务模型（）。A、Best EffortB、FIFO（First Input First Output）C、DiffServ（Differentiated Service）D、IntServ（Integrated Service）
以下哪些不属于QoS中的服务模型（）A、Best EffortB、FIFO（First Input First Output）C、DiffServ（Differentiated ServicE）D、IntServ（Integrated ServicE）
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.
多选题Which two statements about the diffserv model are true？（）Aa class can be inentified as a single application .multiple applications with similar service nees.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 scalabilty.
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.
填空题关于尊重和维护法律权威的重要意义,以下说法不正确的是（）