300-620 Question #349: Real Exam Question with Answer & Explanation

The correct answer is B: It decapsulates VXLAN packets received from leaf switches.. In an ACI fabric the spine’s role is purely L3 - it terminates the VXLAN‐GPE tunnels from the leaves, removes the outer VXLAN header (decapsulation), routes the packet to the correct leaf, then re-encapsulates it for onward delivery. The leaf switches handle bridging and policy e

Question

Which function does spine switch perform in the Cisco ACI fabric?

Options

AIt connects to classic Ethernet devices in the multitier topology.
BIt decapsulates VXLAN packets received from leaf switches.
CIt stores all the entries of endpoints-to-VTEP mapping.
DIt bridges tenant packets for applying network policies.

Explanation

In an ACI fabric the spine’s role is purely L3 - it terminates the VXLAN‐GPE tunnels from the leaves, removes the outer VXLAN header (decapsulation), routes the packet to the correct leaf, then re-encapsulates it for onward delivery. The leaf switches handle bridging and policy enforcement, and neither store the full endpoint-to-VTEP mapping nor connect directly to traditional Ethernet devices.

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