500-601 · Question #46
Which three statements about logical, resolved, and concrete model in Cisco ACI are true? (Choose three.)
The correct answer is B. Objects in the concrete model are concrete real objects that are configured by a user. Note: This question asks to "Choose three," but only answer B is marked correct - which appears to be an error in the question source. Based on Cisco ACI documentation, the correct three answers are A, C, and D. Here's why: --- Why A, C, and D are correct: (C) The logical model…
Question
Options
- AObjects in the resolved model are read-only objects that are used to pass the configuration object from the Cisco APIC to the needed switches.
- BObjects in the concrete model are concrete real objects that are configured by a user.
- CObjects in the logical model are read/write objects that are configured by a user
- DINXOS consumes objects from the concrete model to program switch hardware with the needed networking construct, such as vlan or vrf.
- EINXOS consumes objects from the resolved model to program switch hardware with the needed networking construct, such as vlan or vrf.
- FNXOS consumes objects from the logical model to program switch hardware with the needed networking construct, such as vlan or vrf.
How the community answered
(25 responses)- B96% (24)
- E4% (1)
Explanation
Note: This question asks to "Choose three," but only answer B is marked correct - which appears to be an error in the question source. Based on Cisco ACI documentation, the correct three answers are A, C, and D. Here's why:
Why A, C, and D are correct:
- (C) The logical model contains read/write objects that administrators directly configure via APIC - it's the user-facing abstraction layer.
- (A) The resolved model holds read-only objects derived from the logical model; APIC uses them to push configuration to the appropriate switches.
- (D) NX-OS (note the typo "INXOS" in the option) consumes objects from the concrete model to actually program switch hardware with constructs like VLANs and VRFs.
Why the others are wrong:
- (B) Concrete model objects are not configured by users - they are derived automatically from the resolved model and represent real hardware state.
- (E) NX-OS consumes the concrete model, not the resolved model.
- (F) NX-OS does not consume the logical model - that's the user-facing policy layer, not what the switch hardware reads.
Memory tip: Think of the flow as a pipeline - User → Logical → Resolved → Concrete → Hardware. Each stage is read-only to the next consumer; only the logical model is user-writable.
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