Section: MCSA-70-410

10) Which of the following is NOT a legal notation of the following IPv6 address?

20010DB80000CD3 (hexadecimal):

1. 2001:0DB8:0000:CD30:0000/60
2. 2001:0DB8::CD30:0:0:0:0/60
3. 2001:0DB8:0:CD30::/60
4. 2001:0DB8:0:CD3/60

The 2001:0DB8:0:CD3/60 is not a legal representations of the prefix:

2001:0DB8:0:CD3/60 may drop leading zeros, but not trailing zeros, within any 16-bit chunk of the address.

In order to make writing addresses containing zero bits easier, a special syntax is available to compress the zeros. The use of '::' indicates one or more groups of 16 bits of zeros. The '::' can only appear once in an address. The '::' can also be used to compress leading or trailing zeros in an address.