An organization is assigned an IPv6 address block of 2001:db8:0:ca00::/56. How many subnets can be created without using bits in the interface ID space?

Last Updated: May 3, 2026
IT Exam Items Repository › Category: CCNA 1 v7 › An organization is assigned an IPv6 address block of 2001:db8:0:ca00::/56. How many subnets can be created without using bits in the interface ID space?

An organization is assigned an IPv6 address block of 2001:db8:0:ca00::/56. How many subnets can be created without using bits in the interface ID space?

  • 256
  • 512
  • 1024
  • 4096

Explanation: The organization is assigned a /56 prefix. Since a standard IPv6 subnet uses a /64 prefix length to preserve the 64-bit interface ID space, there are 8 bits available for subnetting (64−56=8). Using the formula 2n, where n is the number of bits, 28 allows for the creation of 256 subnets.

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