● DiffServ是Internet实现QoS的一种方式，它对IP 的主要修改是（25） ，其实现过程可简述为（26） 。 （2

DiffServ，是Internet实现QoS的一种方式，它对IP的主要修改是 (25) ，其实现过程可简述为 (26) 。

（25）

A．设置DS域，将IP分组分为不同的等级和丢弃优先级

B．设置DS域和RSVP协议

C．定义转发等价类

D．定义多种包格式，分别封装不同优先级的数据

A 定义转发等价

B 设置DS域和RSVP协议

C 设置DS域，将IP分组分为不同的等级和丢弃优先级类

D 定义多种包格式，分别封装不同优先级的数据

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

A.FTP

B.HTTP

C.SMTP

D.SNMP