In 200 db8 IPv6 address block is allocated to a load balancer for use as virtual server addresses. The address block balancer set ip address using a static route. What is the representation for the la

2001:db8::ffff:ffff:ffff:ffff uses the compressed '::' notation which collapses middle groups to zero, producing an address well within the block rather than the last address.

2001:db8:: is the network address - the first address of the block with all host bits set to zero - not the last address.

2001:db8::255 only sets the final 8 bits, leaving most host bits at zero, so it represents a very early address in the block rather than the last one.

The last address in any IPv6 prefix block is formed by setting all host bits to their maximum value of 1, which produces all 'f' hex digits in the remaining groups. For the 2001:db8::/32 block, this yields 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff, and choice D represents this fully expanded boundary address with all non-prefix bits maximized.