defaultInstanceTenancy - The default tenancy of instances launched into the VPC.
By setting this to dedicated tenancy, instances will be launched on
hardware dedicated to a single AWS customer, unless specifically specified
at instance launch time. Please note, not all instance types are usable
with Dedicated tenancy.
secondaryAddressBlocks - The secondary CIDR blocks associated with the VPC.
Can be IPv4 or IPv6, two IPv4 ranges must follow RFC#1918 convention
For more information,