You are configuring the IPv6 network infrastructure for a branch office.
The corporate network administrator allocates the 2001:DB8:0:C000::/58 address space for
use in the branch office.
You need to identify the maximum number of IPv6 subnets you can create.
How many IPv6 subnets should you identify?

A.
32

B.
64

C.
128

D.
1024

Explanation:
IPv6 has 128-bit (16-byte) source and destination IP addresses. Although 128 bits can
express over 3.4×1038 possible combinations, the large address space of IPv6 has been
designed for multiple levels of subnetting and address allocation from the Internet backbone
to the individual subnets within an organization.
References:
http://technet.microsoft.com/en-us/library/dd379516%28v=WS.10%29.aspx