1Z0-997-26 Workload Migration Practice Question
You are executing a lift-and-shift migration of a multi-tier application where subnet IP addressing must remain identical to the on-premises environment due to hardcoded IP configurations in legacy software. How should you configure the OCI Virtual Cloud Network (VCN) to accommodate this requirement?
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
✓
Configure the OCI VCN and subnets with the exact same CIDR block ranges as the on-premises network.
OCI VCNs and subnets support bringing your own IP (BYOIP) or matching CIDR blocks. By provisioning an OCI VCN with the exact same CIDR block range as the on-premises subnet, hardcoded IPs can be preserved.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use OCI Flexible Load Balancers configured in Layer 2 bridging mode.
Why it's wrong here
OCI Load Balancers operate at Layer 4 and Layer 7; they do not provide Layer 2 bridging.
- ✓
Configure the OCI VCN and subnets with the exact same CIDR block ranges as the on-premises network.
Why this is correct
Matching the VCN and subnet CIDR blocks allows migrated instances to retain their original private IP addresses.
- ✗
Design the OCI VCN with disjoint RFC 1918 address space and use OCI NAT gateways to rewrite hardcoded IP addresses dynamically.
Why it's wrong here
NAT gateways perform IP translation for outbound internet traffic; they do not rewrite internal application hardcoded IP addresses between tiers.
- ✗
Deploy an OCI API Gateway in front of each virtual machine to proxy internal IP traffic.
Why it's wrong here
API Gateway is for HTTP/REST APIs, not internal L3/L4 server-to-server IP addressing.
Visual reference
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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 1Z0-997-26 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.