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'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

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'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（   ）

题目：某网络用户抱怨．Web及邮件等网络应用速度很慢，经查发现内网中存在大量P2P、 流媒体、网络游戏等应用。为了保障正常的网络需求， 该设备通常部署的网络位置在（    ）。

题目：某网络用户抱怨．Web及邮件等网络应用速度很慢，经查发现内网中存在大量P2P、 流媒体、网络游戏等应用。为了保障正常的网络需求，可以部署(       )来解决上述问题。

题目：某宾馆三层网速异常，ping网络丢包严重。通过对核心交换机查看VLAN接口IP与 MAC，与客户电脑获取的进行对比发现不一致。在交换机上启用DHCP snooping后 问题解决。可以通过（     ）方法杜绝此类故障。

题目：某宾馆三层网速异常，ping网络丢包严重。通过对核心交换机查看VLAN接口IP与 MAC，与客户电脑获取的进行对比发现不一致。在交换机上启用DHCP snooping后 问题解决。该故障是由于（     ）造成。

题目：某办公室工位调整时一名员工随手将一根未接的网线接头插入工位下面的交换机接口， 随后该办公室其他工位电脑均不能上网，可以排除（     ）故障。

题目：TCP使用的流量控制协议是(      )。

题目：采用网络测试工具（    ）可以确定电缆断点的位置。

题目：下列指标中，不属于双绞线测试指标的是（    ）。