300-420 · Question #7
300-420 Question #7: Real Exam Question with Answer & Explanation
The correct answer is A: Use structured hierarchical topology with route summarization. When designing a large EIGRP network with over 1000 routers, effective scaling techniques include utilizing a structured hierarchical topology with route summarization and implementing multiple EIGRP autonomous systems.
Question
What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)
Options
- AUse structured hierarchical topology with route summarization
- BUsed sub-second timers
- CUse the distribute-list command to filter routes
- DModify delay parameters on the links
- EImplement multiple EIGRP autonomous systems
Explanation
When designing a large EIGRP network with over 1000 routers, effective scaling techniques include utilizing a structured hierarchical topology with route summarization and implementing multiple EIGRP autonomous systems.
Common mistakes.
- B. Using sub-second timers would increase the frequency of updates and hello messages, placing more load on routers and negatively impacting scalability in a large network.
- C. Using distribute-lists filters routes but is a filtering mechanism, not a primary scaling technique for reducing overall routing table size or query scope in the way summarization or AS separation does.
- D. Modifying delay parameters on links affects metric calculation but does not directly scale the EIGRP network's control plane or reduce routing table size for a large number of routers.
Concept tested. EIGRP scaling techniques for large networks
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