A network technician is verifying IPv6 address syntax rules while documenting network inte… — CompTIA Network+

A network technician is verifying IPv6 address syntax rules while documenting network interface configurations. The technician needs to compress the full 128-bit IPv6 address $2001:0db8:0000:0000:0000:0000:0000:0001$ . Which of the following valid compressed representations of this address should be accepted? (Select TWO.)

2001:db8::1Answer
2001:db8:0:0:0:0:0:1Answer
C
2001:db8::0::1
D
2001:db8::0:1

Answer

The correct representations are '2001:db8::1' and '2001:db8:0:0:0:0:0:1'.

The shorthand address '2001:db8::1' correctly removes leading zeros in the second hextet and compresses five consecutive zero hextets into a single double colon. The shorthand address '2001:db8:0:0:0:0:0:1' correctly suppresses leading zeros across all hextets while keeping all eight hextets explicitly separated by single colons.

Step-by-Step Solution

Apply the rule for omitting leading zeros within each 16-bit hextet.

The block

0db8

becomes

db8

, and each

0000

block becomes

0

Leading zeros in any hexadecimal group are redundant and can be omitted.

Apply the double-colon compression rule for consecutive zero hextets.

The five consecutive

0000

blocks (

0000:0000:0000:0000:0000

) can be replaced by a single double colon (

::

), resulting in

2001:db8::1

A single double colon (

::

) can replace contiguous fields of zeros to shorten the address.

Verify alternative valid representations without double-colon compression.

Replacing each

0000

block with a single

0

produces

2001:db8:0:0:0:0:0:1

, which contains all 8 hextets and is fully unambiguous.

Double-colon compression is optional; suppressing leading zeros while retaining individual

0

hextets is syntactically valid.

Key Concept

IPv6 Address Compression Rules (RFC 5952)

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