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352-001 · Question #546
352-001 Question #546: Real Exam Question with Answer & Explanation
The correct answer is B: EIGRP with the branch routers setup as stubs. EIGRP stub routing is the most scalable option for DMVPN spoke branches because it limits the EIGRP query domain and reduces unnecessary routing overhead at branch sites.
Question
Refer to the exhibit. Which routing solution is the most scalable to connect the branches to the HQ and to connect the branches together over the internet using DMVPN?
Options
- AEIGRP
- BEIGRP with the branch routers setup as stubs
- COSPF with each branch router as an ABR
- DIS-IS L2 in all locations
- EOSPF Area 0 in all locations
Explanation
EIGRP stub routing is the most scalable option for DMVPN spoke branches because it limits the EIGRP query domain and reduces unnecessary routing overhead at branch sites.
Common mistakes.
- A. EIGRP without stub configuration causes all branch routers to participate in the full query domain, leading to SIA issues and poor scalability across hundreds of sites.
- C. Configuring every branch as an OSPF ABR is operationally complex and requires each branch to maintain and exchange LSAs for multiple areas, which does not scale well for large branch deployments.
- D. IS-IS Level 2 is typically used for large service provider backbones and does not offer the spoke-stub optimization needed for hub-and-spoke DMVPN branch scalability.
- E. Placing all locations in OSPF Area 0 creates a single flat LSA database that grows with every site added, making convergence time and memory consumption unmanageable at large scale.
Concept tested. EIGRP stub routing scalability in DMVPN hub-and-spoke
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