阅读以下短文，回答98-100题。 【IPv6 is not interoperable with IPv4，In essence.it establishes a parallel version of the Internet not directly accessible with IPv4 sofeware.This means softwate upgrades or translator facilities are necessary for networking devices that need to communicate on both networks.Most modern computer operating systems already support both versions of the Internet Protocal.Network infrastrutures，however，are still lagging in this development.Aside form the complex array of physical connections that make up its infrastrure，the Internet is facilitated by bi- or multi-lateral commercial contracts(e.g. pearing agreements)，and by technical spesifications or protocals that describe how to exchange data over the network.Indeed，the Internet is defined by its interconnections and routing policies.】 Based on the paragraph above， it is shown that in order to deploy IPv6 protocol on the Internet，（）has to be built. The network devices which need to communicate with both networks are requir

电信的“八字”服务方针，反映了社会和人民群众对电信的基本要求，即（）。

下列关于ATM网络的描述中，错误的是（）。

帧中继网络的用户网络接口协议体系结构分为用户平面和（）。

下列关于帧中继网和因特网关系的描述中，错误的是（）。

下列IP地址中，属于组播地址的是（）。