CiscoCisco
350-501 · Question #184
350-501 Question #184: Real Exam Question with Answer & Explanation
The correct answer is D: It applies only on the instance and makes at the interfaces inherit the configuration. TI-LFA (Topology Independent-Loop Free Alternate) is a Fast Reroute (FRR) mechanism that applies at the OSPF instance level, making all interfaces within that instance inherit the configuration for quick path protection.
Networking
Question
What is the characteristic of the Tl-LFA?
Options
- AIt guarantees a loop-free path for all interfaces in the OSPf- super backbone.
- BIt applies on each area and instance and makes all the interfaces inherit the configuration
- CIt guarantees a loop-free path for all areas configured m OSPF
- DIt applies only on the instance and makes at the interfaces inherit the configuration
Explanation
TI-LFA (Topology Independent-Loop Free Alternate) is a Fast Reroute (FRR) mechanism that applies at the OSPF instance level, making all interfaces within that instance inherit the configuration for quick path protection.
Common mistakes.
- A. TI-LFA provides loop-free alternate paths for specific prefixes and links within an instance, but the term 'super backbone' is not a standard OSPF construct, and it does not universally guarantee a loop-free path for 'all interfaces' across an entire backbone in that manner.
- B. TI-LFA applies per routing protocol instance, not specifically 'on each area and instance' in a way that suggests separate area-level configuration beyond the instance's scope.
- C. While TI-LFA aims to provide loop-free alternate paths for routes within an OSPF domain, stating it guarantees a loop-free path for 'all areas' is too broad and potentially misleading; its scope is for specific failure scenarios and depends on the topology supporting an LFA.
Concept tested. TI-LFA (Topology Independent-Loop Free Alternate) scope
Topics
#TI-LFA#OSPF#Fast Reroute (FRR)#Routing Protocol Configuration
Community Discussion
No community discussion yet for this question.