Bye default, what are three valid routing tables?

Each routing table is identified by a name, which consists of the protocol family followed by a period and a small, nonnegative integer. The protocol family can be inet (Internet), iso (ISO), or mpls (MPLS). The following names are reserved for the default routing tables maintained by the JUNOS software:

inet.0—Default Internet Protocol version 4 (IPv4) unicast routing table
inet6.0—Default Internet Protocol version 6 (IPv6) unicast routing table
instance-name.inet.0—Unicast routing table for a particular routing instance
inet.1—Multicast forwarding cache
inet.2—Unicast routes used for multicast reverse path forwarding (RPF) lookup
inet.3—MPLS routing table for path information
mpls.0—MPLS routing table for label-switched path (LSP) next hops