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Juniper JN0-460 Exam - Topic 5 Question 15 Discussion
Topic #: 5
Which campus fabric architecture supports Layer 3 gateways at the distribution layer?
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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