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

题目

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&39;s 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


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  • 第1题:

    中国电信在部署MPLSVPN,采用的QOS业务模型为()。

    A.DiffServ

    B.IntServ

    C.DiffServ和IntServ并重

    D.IntServ为主,同时也使用DiffServ


    参考答案:A

  • 第2题:

    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.performance
    B. Secure
    C. privacy
    D.data


    答案:A
    解析:
    在网络中提供QoS的差分服务应用了一种很小的明确定义的构建模块集合来建立各种服务。它的目的就是利用IPv4头部中的服务类型(ToS )和IPv6中的通信类型定义不同的服务字节(DS),而且在每一个网络节点用分组的标准化DS字节来表示它接收到一种特殊的转发处理规则或每跳的行为(PHB)。差分服务体系结构提供了一种框架,使得可以为用户提供一定范围的网络服务,每种服务都有不同的性能。用户只要给分组的差分服务码点(DSCP)字段赋予特殊的值,就可以按照各个分组的需要选择性能级别。这个值说明了在服务提供的网络中给予分组的PHB 。

  • 第3题:

    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-mail
    • E、 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

    正确答案:B,D,E

  • 第4题:

    QoS中通常有以下哪些服务模型()。

    • A、Best Effort
    • B、FIFO(First Input First Output)
    • C、DiffServ(Differentiated Service)
    • D、IntServ(Integrated Service)

    正确答案:A,C,D

  • 第5题:

    中国电信在部署MPLSVPN,采用的QOS业务模型为()。

    • A、DiffServ
    • B、IntServ
    • C、DiffServ和IntServ并重
    • D、IntServ为主,同时也使用DiffServ

    正确答案:A

  • 第6题:

    What are two characteristics of the DiffServ model?()

    • A、service guarantee
    • B、traffic that is divided into classes
    • C、not scalable to large implementations
    • D、QoS mechanisms that are used without prior signaling
    • E、applications that signal their particular QoS and bandwidth requirements

    正确答案:B,D

  • 第7题:

    Which three practices are important to the implementation of a DiffServ QoS architecture?()

    • A、 Because services are allocated throughout the network before the transmission of data begins, traffic classes can be guaranteed QoS services.
    • B、 Traffic classes are marked with Layer 2 markings to allow for more granularity in identifying traffic classes.
    • C、 Traffic classes are marked with Layer 3 markings to allow them to traverse different network types without loss of QoS information.
    • D、 Traffic classes allow networks to provide proper QoS treatment of packets without applications having to request services.
    • E、 Based upon the network capabilities, QoS markings are placed on packets as needed throughout the network to allow for proper QoS treatment of packets.
    • F、 QoS markings are placed on packets as close to the network edge as possible to allow distribution and core devices to determine QoS actions as quickly as possible.

    正确答案:C,D,F

  • 第8题:

    Which three statements are true about the appliance 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-mail
    • E、the IntServ model requires applications to signal the network with QoS requirements
    • F、the IntServ model model attempts to deliver a level of service based on the QoS specified by each packet

    正确答案:B,D,E

  • 第9题:

    城域骨干网以基于DiffServ为主的QoS技术提供突发拥塞时的QoS保证。


    正确答案:正确

  • 第10题:

    单选题
    Which QoS model manages the QoS requirements for the network on a per-hop behavior (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)


    正确答案: B
    解析: 暂无解析

  • 第11题:

    多选题
    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-mail

    E

    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


    正确答案: A,C
    解析: 暂无解析

  • 第12题:

    多选题
    Which three practices are important to the implementation of a DiffServ QoS architecture?()
    A

    Because services are allocated throughout the network before the transmission of data begins, traffic classes can be guaranteed QoS services.

    B

    Traffic classes are marked with Layer 2 markings to allow for more granularity in identifying traffic classes.

    C

    Traffic classes are marked with Layer 3 markings to allow them to traverse different network types without loss of QoS information.

    D

    Traffic classes allow networks to provide proper QoS treatment of packets without applications having to request services.

    E

    Based upon the network capabilities, QoS markings are placed on packets as needed throughout the network to allow for proper QoS treatment of packets.

    F

    QoS markings are placed on packets as close to the network edge as possible to allow distribution and core devices to determine QoS actions as quickly as possible.


    正确答案: A,F
    解析: 暂无解析

  • 第13题:

    城域骨干网以基于DiffServ为主的QoS技术提供突发拥塞时的QoS保证。

    A.错误

    B.正确


    参考答案:B

  • 第14题:

    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

    答案:B
    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。

  • 第15题:

    Which QoS model manages the QoS requirements for the network on a per-hop behavior (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)

    正确答案:F

  • 第16题:

    Diffserv主要采用RSVP协议实现端到端的QoS


    正确答案:错误

  • 第17题:

    QoS的服务模型包括哪几种?()

    • A、Best Effort模型
    • B、IntServ模型
    • C、FIFO模型
    • D、DiffServ模型

    正确答案:A,B,D

  • 第18题:

    以下哪些不属于QoS中的服务模型()

    • A、Best Effort
    • B、FIFO(First Input First Output)
    • C、DiffServ(Differentiated ServicE)
    • D、IntServ(Integrated ServicE)

    正确答案:B

  • 第19题:

    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.

    正确答案:B,E

  • 第20题:

    Cisco Series routers is suitable for small businesses and for connectinq small offices to enterprise networks.() 

    • A、800
    • B、830
    • C、1600
    • D、3700

    正确答案:A

  • 第21题:

    判断题
    城域骨干网以基于DiffServ为主的QoS技术提供突发拥塞时的QoS保证。
    A

    B


    正确答案:
    解析: 暂无解析

  • 第22题:

    多选题
    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.


    正确答案: C,B
    解析: 暂无解析

  • 第23题:

    多选题
    Which three statements are true about the appliance 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-mail

    E

    the IntServ model requires applications to signal the network with QoS requirements

    F

    the IntServ model model attempts to deliver a level of service based on the QoS specified by each packet


    正确答案: F,C
    解析: 暂无解析