CCDE: Cisco Certified Design Expert (Written) — Question 47

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.)

Answer options

• A. MPLS-TE is required to reroute traffic within less than 1 second in case of a link failure inside the backbone.
• B. MPLS-TE is required to route different MPLS QoS service classes through different paths.
• C. MPLS-TE and OSPF cannot be used together inside one MPLS network.
• D. MPLS-TE cannot use OSPF for the traffic path calculation.
• E. MPLS-TE is required to create backup paths independently from the IGP.

Correct answer: B, E

Explanation

The correct answers, B and E, indicate that MPLS-TE allows for differentiated routing of MPLS QoS service classes and the creation of backup paths separate from the IGP. Options A, C, and D are incorrect because MPLS-TE does not specifically require less than 1 second for rerouting, can coexist with OSPF, and can indeed use OSPF for path calculations.