In Juniper Apstra terminology, to which network operating system concept does a routing zone refer?

In Juniper Apstra's vendor-agnostic data model, a 'routing zone' is the abstraction for a Layer 3 virtual routing and forwarding instance (VRF). A routing zone provides traffic isolation and a separate routing table domain within the network fabric. When Apstra renders the configuration for a physical device (like a Juniper QFX switch or an Arista switch), it translates the 'routing zone' construct into the specific VRF configuration syntax required by that device's network operating system (e.g., routing-instances instance-type vrf in Junos).

A. IRB: An Integrated Routing and Bridging interface is a Layer 3 interface on a VLAN, which Apstra models as a virtual network with a gateway, not a routing zone.

C. VLAN: A VLAN is a Layer 2 broadcast domain, which Apstra models as a 'Virtual Network', not a routing zone.

D. Access list: An access list is a packet filter, which Apstra manages through security policies, a concept distinct from a routing zone.

1. Juniper Apstra User Guide, "Blueprints > Staged > Virtual > Routing Zones". The documentation explicitly states, "A routing zone is a collection of virtual networks that are in the same Layer 3 routing domain (a VRF)."

2. Juniper TechLibrary, "Apstra Concepts". The glossary and conceptual overview define a Routing Zone as the Apstra abstraction for a VRF, used to enforce L3 isolation between groups of virtual networks.