The Cisco ACI fabric consists of which design at the physical layer?

Question

Options

• Athree-tier core, aggregation, and access
• Bcollapsed core network
• Cfull mesh
• Dspine-and-leaf

• A
  2% (1)
• B
  2% (1)
• C
  6% (3)
• D
  90% (46)

Explanation

The Cisco Application Centric Infrastructure (ACI) fabric uses a spine-and-leaf physical architecture. Leaf switches connect to end devices (servers, storage, etc.) and every leaf connects to every spine switch. Spine switches only interconnect leaf switches and never connect directly to end devices. This provides a consistent, predictable two-hop latency between any two endpoints in the fabric. It also enables horizontal scaling: adding more leaf switches increases port density, and adding more spine switches increases bandwidth. The three-tier (core/aggregation/access) model is the traditional campus design, the collapsed core is a simplified campus model, and full mesh is impractical at scale.

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