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352-001 · Question #32
352-001 Question #32: Real Exam Question with Answer & Explanation
The correct answer is B: MPLS-TE is required to route different MPLS QoS service classes through different paths.. MPLS-TE enables Diff-Serv-aware traffic engineering for QoS-based path differentiation and allows pre-established backup LSPs that operate independently from the IGP shortest-path topology.
Question
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.)
Options
- AMPLS-TE is required to reroute traffic within less than 1 second in case of a link failure inside the
- BMPLS-TE is required to route different MPLS QoS service classes through different paths.
- CMPLS-TE and OSPF cannot be used together inside one MPLS network.
- DMPLS-TE cannot use OSPF for the traffic path calculation.
- EMPLS-TE is required to create backup paths independently from the IGP.
Explanation
MPLS-TE enables Diff-Serv-aware traffic engineering for QoS-based path differentiation and allows pre-established backup LSPs that operate independently from the IGP shortest-path topology.
Common mistakes.
- A. 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.
- C. 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.
- D. 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.
Concept tested. MPLS-TE QoS path separation and independent FRR backup paths
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