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  3. 【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with I

【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with I

admin2017-11-09  27
问题 【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with IPv4 software．This means soft-ware upgrades or translator facilities are necessary for networking devices that need to communicate on both networks．Most modem computer operating systems already support both versions of the Interact Protocol．
Network infrastructures，however,are still lagging in this development．Aside from the complex array of physical connections that make up its infrastructure，the Internet iS facilitated by bi．or multi-lateral commercial contracts(e．g．peering agreements)，and by technical specifications or protocols that describe how to exchange data over the network．Indeed，the Interact iS defined bv its interconnections and routing policies．】
Based on the paragraph above，it is shown that in order to deploy IPv6 protocol on the Interact，(94) has to bc built．The network devices which need to communicate with both networks are required to have upgraded software or(95)．In the movement of IPv4 to IPv6 transition，(96)are relatively slow in this event．
(96)
选项 A、IPv4 network   
B、translator facilities
C、operating systems
D、network
答案D
解析 本题考查IPv6方面的基础知识。
【IPv6与IPv4是无法互通的。实质上，它和IPv4是平行的互联网版本，但是以IPv4为基础的软件无法直接使用它。这意味着对于需要同时和两种网络通信的网元设备，有必要对其进行软件升级或增加必需的地址翻译设备。目前大多数操作系统都可以支持这两种互联网协议。尽管如此，网络基础设施建设仍然有待发展。互联网除了由组成基础设施的复杂的物理连接阵列，还包括双边或多边的商业条款(如对等协议)、网络数据交换的技术说明或协议等推动其向前发展。从本质上讲，互联网是其内部互联和路由协议所定义的。】
根据上文了解到，为了在互联网内部署IPv6协议，必须建设单独的网络。在IPv4到IPv6的过渡期间，同时和这两种网络通信的网元设备需要进行软件升级或者增加地址翻译设备，因此网络基础设施建设相对比较缓慢。
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