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单选题


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
information
B
Structure
C
.means
D
 framework
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答案:

D

解析:

根据题目描述,差分服务方法在网络中提供QoS 是通过使用一组小的、明确定义的构建模块来实现的。这种方法的目标是定义IPv4头部的服务类型字节和IPv6中的流量类别字节,并对数据包的标准化DS字节进行标记,以便在网络节点上获得特定的转发处理或每跳行为。文中提到差分服务体系结构提供了一个框架(framework),使得服务提供者能够为客户提供一系列网络服务,这些服务基于性能进行区分。因此,横线处应选D(framework)。

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