Binary Pattern of Unique IPv6 Unique Local Address

B.

A IPv6 Unique Local Address is an IPv6 address in the block FC00::/7, which means that IPv6 Unique Local addresses begin with 7 bits with exact binary pattern as 1111 110 -> Answer B is correct.

Note: IPv6 Unique Local Address is the approximate IPv6 counterpart of the IPv4 private address.

It is not routable on the global Internet.

IPv6 Unique Local Addresses (ULAs) are designed to provide a private addressing space for use within an organization without the need for address conflict resolution with globally unique addresses. The binary pattern of an IPv6 ULA is not a fixed value, as it is based on a prefix that is generated randomly by the organization using it. However, there are certain guidelines for the prefix that should be followed to ensure uniqueness.

The format of an IPv6 ULA is as follows:

The first 7 bits of an IPv6 ULA must be set to 1111110, which corresponds to the binary value of FC in hexadecimal. This ensures that the address is easily distinguishable from global addresses, which have different prefix values. The next bit (the 8th bit) must be set to 0, indicating that it is a ULA and not a globally routable address.

The next 40 bits are generated randomly by the organization using the ULA. This ensures uniqueness within the organization, as no two organizations can generate the same 40-bit value. The 16 bits following the random bits represent the subnet ID, which can be used to divide the ULA into smaller subnets if needed.

The final 64 bits represent the interface ID, which is typically derived from the MAC address of the device. This ensures that each device on the network has a unique IP address.

Therefore, the correct answer to the question "What is the binary pattern of unique IPv6 Unique Local Address?" is not A, B, C or D, as the binary pattern of an IPv6 ULA is not a fixed value. Instead, it is generated randomly by the organization using the ULA, following the guidelines outlined above.