Which option is the correct representation of the IPv6 address
2001:0000:150C:0000:0000:41B1:45A3:041D?

A.
2001::150c::41b1:45a3:041d

B.
2001:0:150c:0::41b1:45a3:04d1

C.
2001:150c::41b1:45a3::41d

D.
2001:0:150c::41b1:45a3:41d

Explanation:
Address Representation
The first area to address is how to represent these 128 bits. Due to the size of the numbering
space, hexadecimal numbers and colons were chosen to represent IPv6 addresses. An example
IPv6 address is:
2001:0DB8:130F:0000:0000:7000:0000:140B
Note the following:
•There is no case sensitivity. Lower case “a” means the same as capital “A”.
•There are 16 bits in each grouping between the colons.
– 8 fields * 16 bits/field = 128 bits
There are some accepted ways to shorten the representation of the above address:
•Leading zeroes can be omitted, so a field of zeroes can be represented by a single 0.
•Trailing zeroes must be represented.
•Successive fields of zeroes can be shortened down to “::”. This shorthand representation can only
occur once in the address.
Taking these rules into account, the address shown above can be shortened to:
2001:0DB8:130F:0000:0000:7000:0000:140B
2001:DB8:130F:0:0:7000:0:140B (Leading zeroes)
2001:DB8:130F:0:0:7000:0:140B (Trailing zeroes)
2001:DB8:130F::7000:0:140B (Successive field of zeroes)
Reference: http://www.cisco.com/web/strategy/docs/gov/IPv6_WP.pdf