1Z0-1072-26 Networking Practice Question
An OCI customer has an architecture where VCN-A, VCN-B, and VCN-C are connected to a central DRG in a Hub-and-Spoke topology. VCN-A needs to communicate with VCN-B, but VCN-C must be completely isolated from VCN-A. How should the DRG route tables and attachments be configured?
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
✓
Use custom DRG route tables for each attachment, ensuring VCN-A's route table does not import routes from VCN-C's attachment.
To isolate VCN-C from VCN-A, you assign VCN-A and VCN-C attachments to separate DRG route tables. VCN-A's route table imports routes for VCN-B but does not import routes for VCN-C, and vice versa.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure NAT Gateways on all spoke VCNs.
Why it's wrong here
NAT Gateways manage outbound internet access, not inter-VCN routing isolation.
- ✗
Attach an Internet Gateway to VCN-C to block internal DRG traffic.
Why it's wrong here
Internet Gateways handle public internet traffic, not DRG routing isolation.
- ✓
Use custom DRG route tables for each attachment, ensuring VCN-A's route table does not import routes from VCN-C's attachment.
Why this is correct
Custom DRG route tables and import/export controls allow precise isolation between spoke VCNs.
- ✗
Delete all subnets in VCN-C.
Why it's wrong here
Deleting subnets destroys the application environment instead of resolving the routing requirement.
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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 1Z0-1072-26 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 1Z0-1072-26 exam.