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400-007 · Question #33
400-007 Question #33: Real Exam Question with Answer & Explanation
The correct answer is A: EIGRP. EIGRP and RPVST+ provide fail-closed environments by actively withdrawing or blocking paths when failures are detected, ensuring traffic does not pass over failed or unstable paths.
Question
You are tasked with the design of a high available network. Which two features provide fail closed environments? (Choose two.)
Options
- AEIGRP
- BRPVST+
- CMST
- DL2MP
Explanation
EIGRP and RPVST+ provide fail-closed environments by actively withdrawing or blocking paths when failures are detected, ensuring traffic does not pass over failed or unstable paths.
Common mistakes.
- C. MST maps multiple VLANs to fewer spanning tree instances and is optimized for scale rather than rapid fail-closed convergence, making it less suited for guaranteeing a fail-closed posture compared to RPVST+.
- D. L2MP is not a widely standardized high-availability protocol and does not define a fail-closed behavior that would qualify it for this design requirement.
Concept tested. Fail-closed high availability with EIGRP and RPVST+
Reference. https://www.cisco.com/c/en/us/tech/ip/enhanced-interior-gateway-routing-protocol-eigrp/index.html
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