Which campus fabric architecture supports Layer 3 gateways at the distribution layer?

Question

Options

• Acampus fabric core/distribution - centrally-routed bridging (CRB)
• Bcampus fabric IP Clos
• Ccampus fabric core/distribution - edge-routed bridging (ERB)
• DEVPN multihoming

• A
  7% (3)
• B
  12% (5)
• C
  79% (33)
• D
  2% (1)

Explanation

In Juniper's campus fabric architectures, the location of the Layer 3 gateway (IRB) differentiates between CRB and ERB models: Centrally-Routed Bridging (CRB): L3 gateways are placed at the core layer. Edge-Routed Bridging (ERB): L3 gateways are placed at the distribution layer, closer to the edge. "In the ERB model, Layer 2 gateways are deployed at the access layer, and Layer 3 gateways are deployed at the distribution layer." Option A (CRB): Incorrect -- L3 is at the core, not distribution. Option B (IP Clos): Incorrect -- in 3- stage Clos, L3 is pushed to the access layer. Option D (EVPN multihoming): Incorrect -- this is about redundancy, not gateway placement. Option C (ERB): Correct -- L3 gateways sit at the distribution layer in the ERB architecture.

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