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WhichQoSmodelmanagestheQoSrequirementsforthenetworkonaper－hopbehavior(PHB)basis?()
A.best-effortdelivery
B.ingresscommittedrate（ICR）
C.shapingandpolicing
D.egresscommittedrate（ECR）
E.IntegratedServices（IntServ）
F.differentiatedservices（DiffServ）
参考答案
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The diffserv approach to providing QoS in networks employs a small,well-defined set of building blocks from which you can build a variety of( ).Its aim is to define the differentiated services(DS)byte,the Type of Service(ToS)byte from the Internet Protocol Version 4( )and the Traffic Class byte from IP Version 6,and mark the standardized DS byte of the packet such that it receives a particular forwarding treatment,or per- hop behavior(PHB),at each network node.The diffserv architecture provides a( )within which service providers can offer customers a range of network services,each differentiated based on performance.A customer can choose the(________ )level needed on a packet-by-packet basis by simply marking the packet's Differentiated Services Code Point(DSCP)field to a specific value.This ( ) specifies the PHB given to the packet within the service provider network。横线处应选（ ）
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Which QoS model manages the QoS requirements for the network on a per-hop behavior （PHB） basis？（）A、best-effort deliveryB、ingress committed rate （ICR）C、shaping and policingD、egress committed rate （ECR）E、Integrated Services （IntServ）F、differentiated services （DiffServ）
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Which of these is a valid differentiated services PHB？ （）A、Guaranteed PHBB、Class-Selector PHBC、Reserved Forwarding PHBD、Discard Eligible PHBE、Priority PHB
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关于DiffServ模型体系结构，正确的有（）A、DS区域的服务提供策略由PHB决定B、不同DS区域可有不同的PHB以实现不同的服务提供策略C、所有DS区域的PHB必须相同，以保证服务提供策略连续D、在网络边缘进行业务分类和流量调整
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单选题Which QoS model manages the QoS requirements for the network on a per-hop behavior （PHB） basis？（）A
best-effort deliveryB
ingress committed rate （ICR）C
shaping and policingD
egress committed rate （ECR）E
Integrated Services （IntServ）F
differentiated services （DiffServ）
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单选题Which of these is a valid differentiated services PHB？ （）A
Guaranteed PHBB
Class-Selector PHBC
Reserved Forwarding PHBD
Discard Eligible PHBE
Priority PHB
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单选题A
on the part ofB
other thanC
instead ofD
on the basis of
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