Valid IPv6 Address for All Addresses

Answer - B.

::/0 - The default route address (corresponding to 0.0.0.0/0 in IPv4) covering all addresses (unicast, multicast and others).

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The correct answer is B. ::/0.

Explanation:

IPv6 uses 128-bit addresses compared to 32-bit addresses used by IPv4. IPv6 addresses are represented in hexadecimal notation and are separated by colons (:). A typical IPv6 address looks like this:

2001:0db8:85a3:0000:0000:8a2e:0370:7334

However, in some cases, you may need to specify a range of IPv6 addresses. This can be done using CIDR notation. CIDR notation is used to specify a range of IP addresses by using a base IP address and a subnet mask. The subnet mask specifies which bits in the IP address are the network bits and which bits are the host bits.

In IPv6, the subnet mask is represented by a prefix length, which is the number of bits in the network portion of the address. For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 with a prefix length of 64 would represent the first 64 bits as the network portion and the last 64 bits as the host portion.

The "::" notation can be used in IPv6 addresses to represent consecutive blocks of 0s. For example, the address 2001:0db8:0000:0000:0000:0000:0000:0001 can be abbreviated as 2001:0db8::1.

In the context of the question, the "::/0" notation represents all possible IPv6 addresses. The "/0" prefix length means that all 128 bits in the address are considered to be the network portion, which effectively covers all possible IPv6 addresses.

Option A, 0.0.0.0.0.0.0.0.0 is not a valid IPv6 address. It appears to be an attempt to represent an IPv6 address using IPv4 notation.

Option C, 0.0.0.0 is a valid IPv4 address, but not an IPv6 address.

Option D, 0.0.0.0:/0 is not a valid IPv6 address. It appears to be an attempt to use CIDR notation with an IPv4 address.