300-610 DCID: Designing Cisco Data Center InfrastructureDemo

By Cisco · Question Mode

QuestionQ156

Network Design

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Refer to the exhibit. An engineer must migrate the existing topology to one that offers greater speed, lower latency, and support for software-defined networks. The new topology must provide:

  • separation into core, aggregation, and access routers
  • different server-to-server latency depending on the path taken
  • support for extending the Layer 3 domain by combining access and aggregation routers

Which design topology satisfies these requirements?

  • A flood-and-learn
  • B three-tier
  • C spine-and-leaf
  • D core-edge
Explanation

A three-tier topology separates the network into core, aggregation, and access layers. Its hierarchical forwarding paths can have different hop counts, producing path-dependent server-to-server latency. The aggregation and access functions can support Layer 3 routing boundaries or a combined routed design, while the architecture can be used with software-defined networking. Cisco describes the traditional three-tier data-center model as core, aggregation, and access switching; by contrast, spine-and-leaf is designed for consistent latency between workloads.

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