A service provider creates a network design that runs MPLS in its WAN backbone using OSPF as the IGP routing protocol. What would be two effects of additionally implementing MPLS-TE? (Choose two.)

Sub-second rerouting can also be achieved through other mechanisms such as IP LFA FRR without MPLS-TE, so the statement that MPLS-TE is strictly required for rerouting within less than 1 second is incorrect.

MPLS-TE with Diff-Serv Traffic Engineering (DS-TE) allows different QoS service classes to be mapped to separate TE tunnels that follow different physical paths through the network, which plain OSPF-based MPLS forwarding cannot achieve on its own.

MPLS-TE is fully compatible with OSPF and actually relies on OSPF-TE extensions (Type 10 opaque LSAs) to flood traffic engineering topology information used for path computation.

MPLS-TE uses OSPF (with TE extensions) as input to the Constrained Shortest Path First (CSPF) algorithm for TE tunnel path calculation, meaning the two protocols work together rather than being incompatible.

MPLS-TE Fast ReRoute (FRR) pre-establishes backup label-switched paths (LSPs) that are independent of the IGP topology, allowing traffic to be rerouted over pre-computed detours without waiting for OSPF to reconverge after a failure.