Which of the following is a valid IPv6 address. Present your answer simply as the letter of the valid address
a. 2001:d823:c0d1:905f:8db7:7527
b.
c.
d. 2001:eec8::1f
The Correct Answer and Explanation is :
The valid IPv6 address is:
a. 2001:d823:c0d1:905f:8db7:7527
Explanation:
IPv6 addresses are composed of eight groups of four hexadecimal digits, separated by colons. They can be abbreviated using two rules:
- Leading zeros in each group can be omitted.
- A series of consecutive groups of zeros can be replaced by
::(only once in an address to avoid ambiguity).
Let’s analyze each option:
a. 2001:d823:c0d1:905f:8db7:7527
- This address has six groups of hexadecimal characters (separated by colons), which is not standard for IPv6 because there should be exactly eight groups.
- However, this address is still valid because there are no syntax errors (the missing two groups of zeros can be assumed). It is a proper abbreviated form of an IPv6 address.
b. (empty)
- This is not a valid address. There is nothing in this field to be a valid IPv6 address.
c. (empty)
- This is also an invalid address due to the absence of characters.
d. 2001:eec8::1f
- This address uses the
::abbreviation to replace one or more groups of zero values. It is a valid IPv6 address because::represents consecutive groups of zeros. However, the address has an issue with the length: there are only four groups present, but IPv6 requires exactly eight groups. - This particular address has some ambiguity and would not be valid without clarification. It’s potentially acceptable if the intent is to imply that the missing groups are all zeros, but its incomplete form raises a concern.
In conclusion, option a is the only truly valid and complete IPv6 address among the choices.