1Z0-1072-26 Networking Practice Question
Your organization has two Virtual Cloud Networks (VCN-A and VCN-B) in the same OCI region with overlapping CIDR blocks (10.0.0.0/16). You need to establish private communication between instances in VCN-A and VCN-B. Which networking feature should you implement?
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
✓
Dynamic Routing Gateway (DRG) with overlapping CIDR encapsulation or IPsec VPN over DRG loopback
When VCNs have overlapping CIDRs, standard Local Peering or standard DRG VCN attachments will fail due to route conflicts. You must use a DRG with VCN-to-VCN routing features combined with Network Address Translation (NAT) inside the DRG or utilize IP tunneling constructs, but standard direct local peering is impossible.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Remote Peering Connection (RPC)
Why it's wrong here
RPCs are used for VCN peering across different regions and also do not natively support overlapping CIDRs without tunneling.
- ✗
Local Peering Gateway (LPG)
Why it's wrong here
LPGs do not support peering between VCNs with overlapping CIDR blocks.
- ✓
Dynamic Routing Gateway (DRG) with overlapping CIDR encapsulation or IPsec VPN over DRG loopback
Why this is correct
When VCNs have overlapping CIDR blocks, you can route traffic by establishing an IPsec VPN tunnel between the VCNs via a DRG, allowing NAT translation or encapsulated routing.
- ✗
Internet Gateway with IP masquerading rules
Why it's wrong here
Internet Gateways expose traffic to the public internet and do not handle private overlapping VCN routing.
Visual reference
About these practice questions
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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.