350-501 · Question #180
350-501 Question #180: Real Exam Question with Answer & Explanation
The correct answer is A: It consumes more memory and CPU resources than NSF. Non-Stop Routing (NSR) offers higher availability than Non-Stop Forwarding (NSF) by syncing control plane states, but this comes at the cost of increased resource consumption and does not require peer routers to also support NSR.
Question
What are two factors to consider when implementing NSR High Availability on an MPLS PE router? (Choose two.)
Options
- AIt consumes more memory and CPU resources than NSF
- BIt operates normally without NSR support on the PE peers.
- CIt requires all PE-CE sessions to support NSR
- DIt requires routing protocol extensions
- EIt cannot sync state information across redundant RPs
Explanation
Non-Stop Routing (NSR) offers higher availability than Non-Stop Forwarding (NSF) by syncing control plane states, but this comes at the cost of increased resource consumption and does not require peer routers to also support NSR.
Common mistakes.
- C. NSR is a local router feature for RP redundancy and state synchronization and does not impose a requirement for all PE-CE sessions to support NSR themselves; their interaction with the PE router remains standard.
- D. While routing protocols need to be configured for graceful restart or NSF capabilities to work effectively with high-availability features, NSR itself is a system-level mechanism for RP state synchronization, not a feature that inherently requires additional routing protocol extensions beyond standard NSF functionality.
- E. The primary purpose and benefit of NSR is to sync state information across redundant RPs, ensuring that the standby RP has the necessary control plane state to take over seamlessly upon an active RP failure, making this statement incorrect.
Concept tested. Non-Stop Routing (NSR) characteristics and requirements
Topics
Community Discussion
No community discussion yet for this question.