Oracle OCI Training in Hyderabad | Expert OCI Training
                     OCI Virtual Cloud Network Internet gateway
VCN  10.0.0.0/16
(VCN): Architecture and 
Setup Guide Public subnetLoad balancer
W H AT  Y O U  W I L L  L E A R N
• Understand VCN concepts and design
• Learn each core network component
Private subnet
• Follow a simple setup workflow Apps and databases
• Explore tools, use cases, and careers
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Introduction
• A VCN is your private network inside Oracle Cloud
• It connects compute, databases, and storage Compute Database
securely
• Every OCI workload depends on a well-designed 
network VCN
• Poor network design causes security gaps and 
outages
• Good design supports growth, compliance, and Storage
cost control
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OCI VCN Architecture and Setup Guide
Core Concepts
OCI Region
• Definition: a virtual, software-defined version of a 
traditional network VCN 10.0.0.0/16
• Belongs to one OCI region and spans its availability 
domains
Subnet A Subnet B
• Uses private IP ranges written in CIDR notation 10.0.1.0/24 10.0.2.0/24
• Subnets divide the VCN into smaller network 
segments
• Routes and security rules control all traffic Route tables and security rules
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OCI VCN Architecture and Setup Guide
Key Components
SN Subnet RT Route table IGW Internet gateway
Segment of the VCN, public or Directs traffic to gateways or Two-way internet access for 
private other targets public subnets
NAT NAT gateway SGW Service gateway SL Security lists, NSGs
Outbound-only internet Private access to Oracle Virtual firewall rules for traffic 
access for private resources services like Object Storage control
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OCI VCN Architecture and Setup Guide
How It Works
1 2 3 4 5 6
Plan Create VCN Add subnets Connect Secure Test
Choose CIDR ranges Set up the VCN in a Create public and Attach gateways and Define security lists Launch instances and 
and subnet layout compartment private subnets edit route tables or NSG rules verify connectivity
Tip: The console wizard automates steps 2 to 4.
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OCI VCN Architecture and Setup Guide
Tools and Technologies
OCI Console Guided wizard to create a VCN in minutes
OCI CLI Script and automate network tasks from a terminal
Terraform Repeatable networks as code, run through Resource Manager
Network Path Analyzer Find why two resources cannot connect
VCN Flow Logs Record traffic for auditing and troubleshooting
Bastion Service Secure access to private hosts without public IPs
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OCI VCN Architecture and Setup Guide
Real-World Use Cases
Web applications Hybrid cloud
Public load balancer, private app and database Link data centers using VPN or FastConnect
tiers
Regulated industries Environment separation
Isolate sensitive finance and healthcare data in Keep development, test, and production in 
private subnets separate VCNs
Hub-and-spoke
Central VCN shares firewalls and DNS with other VCNs
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OCI VCN Architecture and Setup Guide
Benefits and Challenges
Benefits Challenges
• Strong isolation and fine-grained security • Overlapping CIDR ranges block peering 
control and hybrid links
• Flexible design that grows with your • One wrong route or rule can break 
workloads applications
• Private connections to on-premises • Many VCNs need clear naming, tagging, 
networks and Oracle services and documentation
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OCI VCN Architecture and Setup Guide
Careers and Future Trends
Job roles Skills needed
Cloud network engineer, cloud architect, IP addressing, routing, firewalls, and 
and DevOps engineer Terraform basics
Industry demand Future outlook
Steady demand as enterprises move critical Zero-trust design, network automation, and 
workloads to cloud multicloud connectivity
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OCI VCN Architecture and Setup Guide
Summary and Conclusion F I N A L  T H O U G H T
• A VCN is the foundation of every OCI deployment Design the network 
• Plan CIDR ranges and subnets before building first, and 
• Use private subnets and gateways to limit exposure everything built on 
it is safer.
• Prefer NSGs for flexible, workload-level security
• Automate with Terraform and monitor with flow logs
• Practice in labs to build real skills
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OCI VCN Architecture and Setup Guide
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OCI VCN Architecture and Setup Guide
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OCI VCN Architecture and Setup Guide