1Z0-997-26 High Availability And Disaster Recovery Practice Question
When designing high availability across multiple Availability Domains in an OCI region, how should database or application subnets be configured to ensure fault tolerance?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create regional subnets so that instances can be placed across multiple Availability Domains.
Subnets in OCI can be regional or AD-specific. For high availability across ADs, architects should deploy regional subnets or span instances across multiple AD-specific subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Restrict all subnets to a single Availability Domain to prevent cross-AD latency.
Why it's wrong here
Restricting subnets to a single AD creates a single point of failure if that AD goes down.
- ✓
Create regional subnets so that instances can be placed across multiple Availability Domains.
Why this is correct
Regional subnets span all ADs in a region, making it easy to place backend instances across ADs.
- ✗
Disable security lists on subnets to allow uninterrupted cross-AD replication traffic.
Why it's wrong here
Disabling security lists compromises VCN security and is a bad practice.
- ✗
Attach all VNICs directly to the Dynamic Routing Gateway without using subnets.
Why it's wrong here
VNICs must be attached to subnets within a VCN.
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About these practice questions
This 1Z0-997-26 question is part of Courseiva's 344-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Oracle exam blueprint
This 1Z0-997-26 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-997-26 exam.