Which of the following is NOT a correct notation for an IPv6 address?
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A. B. C. D.D.
This is not a correct notation for an IPv6 address because the the "::" can only appear once in an address.
The use of "::" is a shortcut notation that indicates one or more groups of 16 bits of zeros.
::1 is the loopback address using the special notation Reference: IP Version 6 Addressing Architecture http://tools.ietf.org/html/rfc4291#section-2.1
Answer:
D. 2001:DB8::8:800::417A is not a correct notation for an IPv6 address.
Explanation:
IPv6 (Internet Protocol version 6) is the most recent version of the Internet Protocol (IP) that provides a unique address to every device connected to the internet. IPv6 addresses are 128-bit long, and they are written in hexadecimal notation. The format of an IPv6 address is divided into eight 16-bit groups, separated by colons (:). Each group can be represented by four hexadecimal digits.
Let's break down each of the options given in the question:
A. 2001:0db8:0:0:0:0:1428:57ab This is a valid IPv6 address that follows the correct notation. Each group is represented by four hexadecimal digits, and the leading zeros can be omitted. So, 0db8 is the same as db8. The double colons (::) indicate that there are two groups of zeros that have been compressed.
B. ABCD:EF01:2345:6789:ABCD:EF01:2345:6789 This is also a valid IPv6 address that follows the correct notation. Each group is represented by four hexadecimal digits, and there are no compressed groups.
C. ::1 This is a valid IPv6 address that represents the loopback address, which is similar to 127.0.0.1 in IPv4. The double colons (::) indicate that there are six groups of zeros that have been compressed.
D. 2001:DB8::8:800::417A This is not a valid IPv6 address because it violates the rules for compressing zeros. The double colons (::) can only be used once in an IPv6 address to compress consecutive groups of zeros. In this case, there are two double colons, which is not allowed.
Therefore, the correct answer is D. 2001:DB8::8:800::417A is not a correct notation for an IPv6 address.