A．days
- Adays
- Bperiod
- Cphase
- Depoch
问题
A．days
参考解析：
解析：IPv6是“互联网协议第6版”的简称，它是由IETF设计的下一代互联网协议，目的是取代(replace)现有的互联网协议第4版(IPv4)。目前，大多数互联网使用的IPv4已经有了20多年的历史。虽然IPv4在过去的应用中具有不同寻常的(remarkably)业绩，但是现在看来已经暴露出很多缺点。最为重要的是，现在的互联网(IPv4)已经面临地址短缺(shortage)的问题，而这正是所有新加入互联网的计算机所迫切需要的。IPv6能够解决IPv4存在的诸如有效网络地址受限(limited)等问题，同时还对IPv4做了大量的改进，包括路由和网络自动配置等。IPv6和IPv4将在过渡期(period)内共存几年，以后IPv6将渐渐取代IPv4。
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