1Z0-1072-26 Networking Practice Question
You are planning IP address allocation for a multi-tier application in OCI. You create a VCN with CIDR 172.16.0.0/16. You need three subnets: web (100 hosts), app (200 hosts), and database (50 hosts). Which combination of subnet CIDRs is valid and non-overlapping?
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
✓
Web: 172.16.1.0/24, App: 172.16.2.0/24, DB: 172.16.3.0/26
Subnet CIDRs must be non-overlapping and sized appropriately. For example, 172.16.1.0/24 (256 addresses), 172.16.2.0/24 (256 addresses), and 172.16.3.0/26 (64 addresses) fit within 172.16.0.0/16 without overlapping.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Web: 10.0.1.0/24, App: 10.0.2.0/24, DB: 10.0.3.0/24
Why it's wrong here
These subnets are outside the VCN CIDR range of 172.16.0.0/16.
- ✓
Web: 172.16.1.0/24, App: 172.16.2.0/24, DB: 172.16.3.0/26
Why this is correct
These CIDRs are non-overlapping, fit within 172.16.0.0/16, and provide enough hosts for each tier.
- ✗
Web: 172.16.0.0/15, App: 172.16.0.0/16, DB: 172.16.1.0/24
Why it's wrong here
172.16.0.0/15 overlaps with 172.16.0.0/16.
- ✗
Web: 172.16.1.0/24, App: 172.16.1.0/24, DB: 172.16.3.0/24
Why it's wrong here
Web and App share the exact same CIDR (172.16.1.0/24), which creates an overlap.
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
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