你好,本人遇到一条题目是关于ipv6分配 subnet, 内容如下:

your company get a global address by ASP which prefix is 3FFA:FF2B:4D:B000::/41. your company has four departments. You have to assign a subnet to each department. In this way, which subnetted address prefix will you assign to the fourth department?

A. 3FFA:FF2B:4D:C800::/43
B. 3FFA:FF2B:4D:B400::/43
C. 3FFA:FF2B:4D:C000::/43
C. 3FFA:FF2B:4D:F000::/45
E. None of the above

Answer:A

关于subnet那部份我知道为什么是43, 由于他有4个department, 而2的2次方等于4化成bit等到11,所以他的subnet由41扩充到43.

但是关于header部分,我不知道怎样分配,例如由分配给第一个department的subnet时候应该是 3FFA:FF2B:4D:xxxx:://43,那个xxxx是怎样计算呢?我不知道了

我查了很多关于ipv6的网站也没有这方面的知识==