DiffServ模型由下列哪些组件构成（）。A、DS域（Differentiated Service Domain）B、DS边界节点（DS Boundar Nodes）C、DS内部节点（DS Interior Nodes）D、边界链路和内部链路E、非DS域F、DS区（Differentiated Service Region）
DiffServ模型由下列哪些组件构成（）。
- A、DS域（Differentiated Service Domain）
- B、DS边界节点（DS Boundar Nodes）
- C、DS内部节点（DS Interior Nodes）
- D、边界链路和内部链路
- E、非DS域
- F、DS区（Differentiated Service Region）
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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 packets Differentiated Services Code Point (DSCP) field to a specific value.This ( ) specifies the PHB given to the packet within the service provider network.A.servicesB.UsersC.networksD.structuresA.messageB.PacketC.headerD.packageA.informationB.StructureC.meansD.frameworkA.performanceB.SecureC.privacyD.dataA. packetB.valueC.serviceD.paragraph
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（ ） A.performanceB. SecureC. privacyD.data
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（ ）(72)A message B. PacketC.header D. package A. messageB. PacketC.headerD.package
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（ ） A.informationB. StructureC .means D.framework
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
单选题明渠均匀流的总水头H和水深h随流程s变化的特征是（ ）。[2017年真题]AdH/ds＜0，dh/ds＜0BdH/ds＝0，dh/ds＜0CdH/ds＝0，dh/ds＝0DdH/ds＜0，dh/ds＝0
单选题国产水准仪的型号一般包括DS05、DS1、DS3，精密水准仪是指（）。ADS05、DS3BDS05、DS1CDS1、DS3DDS05、DS1、DS3