Which two feature-and-router combinations are required to enable MPLS forwarding?
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Correct answer: MPLS on PE and core routers, LDP on PE and core routers.
Why this is the answer
To enable MPLS forwarding, you need to enable MPLS on all participating routers: the Provider Edge (PE) routers and the core (P) routers. Customer Edge (CE) routers are typically not MPLS-aware. Label Distribution Protocol (LDP) is the most common protocol used to distribute MPLS labels between these routers, so it must also be enabled on the PE and core routers. Cisco Express Forwarding (CEF) is a prerequisite for MPLS but is enabled by default on most modern Cisco devices and is not a feature you explicitly enable for MPLS forwarding itself, nor is it specific to PE and CE routers in this context.
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