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400-007 · Question #149
400-007 Question #149: Real Exam Question with Answer & Explanation
The correct answer is A: It is a well-understood architecture that provides scalability. The hierarchical LAN design model is recognized for being a scalable, well-understood architecture that allows changes and new services to be introduced in a controlled, staged manner at each layer.
Question
Which two statements describe the hierarchical LAN design model? (Choose two)
Options
- AIt is a well-understood architecture that provides scalability
- BIt is the best design for modern data centers
- CIt is the most optimal design but is highly complex
- DIt provides a simplified design
- EChanges, upgrades, and new services can be introduced in a controlled and stagged manner
Explanation
The hierarchical LAN design model is recognized for being a scalable, well-understood architecture that allows changes and new services to be introduced in a controlled, staged manner at each layer.
Common mistakes.
- B. Modern data centers typically adopt the spine-leaf (Clos) topology rather than the traditional three-tier hierarchical model, as spine-leaf better supports east-west traffic patterns and horizontal scaling.
- C. The hierarchical model is specifically designed to reduce operational complexity through separation of functions into distinct layers, so characterizing it as 'highly complex' contradicts its core design principle.
- D. The addition of distinct layers (core, distribution, access) introduces architectural structure that increases manageability and predictability, but 'simplified design' is not the primary or defining characteristic of the hierarchical model.
Concept tested. Hierarchical LAN design model characteristics and benefits
Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/DesignGuide/campdesign.html
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