1Z0-1085-23 · Question #161
Which statement accurately describes an Oracle Cloud Infrastructure Region?
The correct answer is B. Each Availability Domain has three Fault Domains. See the full explanation below for the reasoning.
Question
Which statement accurately describes an Oracle Cloud Infrastructure Region?
Options
- AEach Availability Domain has a single Fault Domain.
- BEach Availability Domain has three Fault Domains.
- CEach Fault Domain has multiple Availability Domains.
- DEach region has a single Fault Domain.
How the community answered
(31 responses)- A13% (4)
- B81% (25)
- C3% (1)
- D3% (1)
Community Discussion
5
Viktor S.May 29, 2026B is correct. An Availability Domain is a self-contained data center within a region, and OCI gives each one exactly three Fault Domains so that hardware failures, maintenance, or power issues in one FD do not take down the other two, which is the whole point of spreading workloads across FDs in the first place.
Anjali D.May 20, 2026I keep coming back to C on this one because the way I read OCI's architecture, the Fault Domain is the broader container that groups your compute resources, and Availability Domains sit inside that structure to give you that extra layer of redundancy within each Fault Domain. Has anyone else been reading it that way, or am I totally off base here?
Mei-Ling H.May 21, 2026Anjali, you actually have the hierarchy flipped, which is easy to do since the names are similar. Availability Domains are the top-level isolated data centers within a region, and Fault Domains are the smaller groupings that live inside each Availability Domain, so B is correct.
Mei-Ling H.Jun 7, 2026Saw this exact wording on my exam, "each AD has three FDs" locked it.
Viktor S.Jun 8, 2026Three FDs is the default, but if you understand that FDs are just FSMO role holders and AD trusts are separate from FD count, you will stop panicking the moment a question throws a non-default config at you.