Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 251

How does Cisco MPLS TE use OSPF extensions to allow for optimized transit between a headend router and a destination router?

Answer options

• A. Router LSAs share router link advertisements to each router within the MPLS environment so that tunnels can be built bidirectionally.
• B. ASBR Summary LSAs share OSPF domain information so that the two routers know how to reach each other during tunnel setup.
• C. Network LSAs share RSVP information to build the tunnel between the two routers.
• D. Opaque LSAs calculate and establish unidirectional tunnels that are set according to the network constraint.

Correct answer: D

Explanation

The correct answer is D because Opaque LSAs are specifically designed to carry information about MPLS Traffic Engineering, allowing for the calculation and establishment of unidirectional tunnels based on network constraints. Options A, B, and C describe different LSA types but do not accurately reflect the role of Opaque LSAs in MPLS TE tunnel establishment.