350-501 Question #283: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An organization s network recently experienced several significant outages due to device failures. The network administrator just moved the network devices to a new central data center, and packets are switched using labels. The administrator Is now implementing NSF on the network to reduce potential risk factors in the event of another outage. Which task must the administrator perform on each router as part of the process?

Options

• ARemove route filtering to speed repopulation of the link-state database
• BCopy the router s existing state information and share the file with its peers to enable BGP soft
• CImplement MPLS to forward packets while the RIB updates after a faliover.
• DImplement Graceful Restart to mitigate the delay in MPLS LDP synchronization when the IGP

Explanation

To implement NSF in an MPLS-enabled network, the administrator must configure Graceful Restart on each router to allow neighboring devices to maintain forwarding paths during control plane restarts and facilitate seamless LDP synchronization.

Common mistakes.

• A. Removing route filtering is unrelated to the core mechanism of NSF/Graceful Restart and could lead to uncontrolled route propagation.
• B. Manually copying and sharing state information is not a standard or scalable method for implementing NSF; Graceful Restart automates the process of preserving forwarding state.
• C. MPLS is already described as being in use ('packets are switched using labels'); the task is about implementing NSF within that MPLS context, not implementing MPLS itself.

Concept tested. Non-Stop Forwarding (NSF) and Graceful Restart in MPLS

Reference. https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/mp_nsf_gr_ps_xe_gsg.html

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