300-420 ENSLD Practice Questions: IGP Design, IS-IS, EIGRP, OSPF Stability, Security, and Scale

300-420 ENSLD: IGP Design - IS-IS, EIGRP, and OSPF

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A multinational enterprise is redesigning its WAN routing architecture for 1,200 branch locations. The current flat OSPF Area 0 design experiences excessive SPF recalculations during regional link instability. The design team wants to reduce the failure domain size while preserving deterministic path selection and operational simplicity. Which design approach best satisfies these requirements?

Select one option.

Deploy EIGRP stub routing at all branches while maintaining a single EIGRP AS enterprise-wide
Implement OSPF multi-area hierarchy with regional areas connected to a centralized backbone area
Migrate all branches to IS-IS Level 1 only routing domains
Redistribute static routes into OSPF NSSA areas from every branch edge router
Enable OSPF flood reduction and maintain the flat backbone design

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