下面关于IPv6的描述中，最准确的是（ ）。
- A.IPv6可以允许全局IP地址重复使用
- B.IPv6解决了全局IP地址不足的问题
- C.IPv6的出现使得卫星联网得以实现
- D.IPv6的设计目标之一是支持光纤通信
正确答案及解析
正确答案
解析
目前全球因特网所采用的协议族是TCP/IP协议族。IP是TCP/IP协议族中网络层的协议，是TCP/IP协议族的核心协议。IPv6正处在不断发展和完善的过程中，它在不久的将来将取代目前被广泛使用的IPv4。每个人将拥有更多IP地址。
（1）IPV6地址长度为128位，地址空间增大了2的9 6次方倍；
（2）灵活的IP报文头部格式。使用一系列固定格式的扩展头部取代了IPV4中可变长度的选项字段。IPV6中选项部分的出现方式也有所变化，使路由器可以简单路过选项而不做任何处理，加快了报文处理速度；
（3）IPV6简化了报文头部格式，字段只有8个，加快报文转发，提高了吞吐量；
（4）提高安全性。身份认证和隐私权是IPV6的关键特性；
（5）支持更多的服务类型；
（6）允许协议继续演变，增加新的功能，使之适应未来技术的发展；
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