Given the RSVP Signaled Service Provider MPLS Core network shown in the exhibit, only a single Label Switched Path (LSP) is required to support all four networks because MPLS can use label stacking to multiplex multiple LSPs over a single physical path. Therefore, one LSP can be established through the MPLS core, and all networks can use this LSP with different label stacks.
[References:, MPLS Fundamentals, Juniper Networks Documentation, RSVP-TE Signaling, Juniper Networks Documentation, , ]
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