Question

1. Write 2001:0db8:0000:0015:0000:0000:1a2f:1a20 in its most abbreviated format that is permitted for an IPv6 address.

2. IPv6 globally routable unicast addresses start with the first 4 hex character range from ______ to ______.

3. The IPv6 address in #1 above it which type of IPv6 address?

Answer 1

PART1 :

The most abbreviated format in which this address can be written, that is permitted for an IPv6 address, is as follows. 2001:db8:0:15::1a2f:1a20

There are certain rules which you can use to get the abbreviated format of the IPv6 address.

1) You can remove the all-zero continuous hextets, and add two colons in their place, but you can do that only once in an address.

So, here there are two continuous hextets of zeroes which come after 0015 and before 1a2f. So you take them and replace them with two colons. Remember you use this rule only once, so take the longest sequence of zeroes.

2) You can remove a single hextet of zeroes and replace them by a single zero. Use this rule after applying the first one.

So, you take the hextet after 0db8 and replace it with 0.

3) You can remove any leading zeroes from a hextet.

In the above address, you can replace 0db8 with db8 and 0015 with 15, but you cannot replace 1a20.

PART2

IPv6 globally routable unicast addresses start with the first 4 hex character range from 2000 to 3fff.

PART3

Since the first hextet in the given address falls between 2000 to 3fff, this address is a Global Unicast Address.

For more information, please refer to "http://www.ciscopress.com/articles/article.asp?p=2803866&seqNum=4" and "https://tools.ietf.org/html/rfc4291#section-2.5".

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