You are asked to configure a new network environment that will be based on IPv6...

When transitioning to an IPv6 environment usingOSPFv3(the version of OSPF designed for IPv6), there are significant architectural differences compared to OSPFv2 (IPv4). According to Juniper Networks technical documentation, OSPFv3 was redesigned to be more protocol-agnostic.

Router ID (Option C):

Despite OSPFv3 routing IPv6 (which uses 128-bit addresses), the OSPFRouter IDremains a32-bit valueformatted like an IPv4 address (e.g., 1.1.1.1). This is a common point of confusion. In a pure IPv6 environment where no IPv4 addresses are configured on any interfaces, a Juniper router cannot automatically derive a Router ID. Therefore, the administrator must manually configure a 32-bit Router ID under [edit routing-options] for the OSPFv3 process to initialize.

Interface Configuration (Option D):

OSPFv3 runs directly over the IPv6 link-local scope. Unlike OSPFv2, it does not require an IPv4 address to function. Therefore, interfaces areonly required to be configured with family inet6(Option D). You do not need "dual-stack" (both IPv4 and IPv6) functionality just to run OSPFv3. The protocol uses the link-local address (fe80::/10) of the interface for neighbor adjacencies and as the next hop for routing updates. This separation allows OSPFv3 to carry multiple "address families" (both IPv4 and IPv6 unicast) if needed, but the base requirement for an IPv6-only network is simply the family inet6 configuration.