Which statement is correct about a three-stage IP fabric underlay?

Question

Options

• AEvery ingress interface into the fabric is only two hops away from the egress interface.
• BEvery spine device can communicate directly with other spine devices.
• CEvery leaf device can communicate directly with other leaf devices.
• DEvery server that connects to a three-stage IP fabric must be multihomed.

• A
  87% (26)
• B
  3% (1)
• C
  7% (2)
• D
  3% (1)

Explanation

In a three-stage IP fabric (also known as a Clos fabric), traffic between any two points (ingress to egress) in the fabric is only two hops away. Three-Stage IP Fabric: Leaf Layer: Leaf switches connect directly to servers and edge devices. Spine Layer: Spine switches provide connectivity between leaf switches but do not connect to each other directly. Two-Hop Communication: In this architecture, every leaf switch is connected to every spine switch. Therefore, when a packet enters the fabric via an ingress leaf switch, it is forwarded to a spine switch, which then directs the packet to the correct egress leaf switch. This path always involves exactly two hops: Ingress leaf Spine Egress leaf. This consistent two-hop path ensures predictable latency and makes the network highly scalable while maintaining low complexity.

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