Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 179

Which two features describe TI-LFA? (Choose two.)

Answer options

• A. TI-LFA uses PQ or P and Q nodes on the post-convergence path to compute the backup path.
• B. Post-convergence, TI-LFA considers the next-hop neighbor to calculate the backup repair path.
• C. TI-LFA works with point of local repair when the PQ node supports only LDP capability.
• D. Unlike RLFA, TI-LFA works without the PQ node and provides double segment failure protection.
• E. TI-LFA leverages the post-convergence path that carries data traffic after a failure.

Correct answer: A, E

Explanation

The correct answers are A and E because TI-LFA indeed uses PQ or P and Q nodes for calculating backup paths and leverages the post-convergence path for data traffic after a failure. Option B is incorrect as it suggests a different mechanism that does not align with TI-LFA's functionality, while C and D describe scenarios that do not accurately represent TI-LFA's characteristics.