A reference whitepaper for enterprise architects designing a landing zone that needs to work the same way across two or more cloud platforms — covering account/compartment structure, identity federation, network topology, and governance guardrails as a single coherent model rather than per-cloud silos.
Why landing zones diverge across clouds
Most enterprises end up with a well-designed landing zone on their primary cloud and an ad hoc one on their secondary cloud, because the second landing zone gets built under deadline pressure by whichever team inherits the first workload — this whitepaper’s reference model is deliberately cloud-agnostic at the governance layer so the guardrails don’t have to be redesigned per platform.
What the reference model standardizes
A consistent three-tier account/compartment hierarchy (organization, environment, workload), a single federated identity source, a hub-and-spoke network pattern with centralized egress inspection, and a shared tagging taxonomy that feeds cost allocation regardless of which cloud a resource lives on.
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