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Cloud Networking: VPCs, Subnets & Peering

From CIDR basics to VPCs, subnets, routing, NAT, security groups, peering, transit gateways, PrivateLink, hybrid links and troubleshooting.

Learn Cloud Networking free, in English or Hindi, with lessons, shorts and interview questions.

Start course → · Interview questions

33 lessons · 11 modules · Free

What you'll learn

  • Read and plan IPv4 and IPv6 address space with CIDR, avoiding overlaps that block future connectivity.
  • Design VPCs with public and private subnets across Availability Zones, with correct route tables.
  • Provide internet access safely using internet gateways, NAT gateways and egress-only gateways.
  • Filter traffic with stateful security groups and stateless network ACLs following least privilege.
  • Connect networks with peering, transit gateways, shared VPCs, PrivateLink, VPN and dedicated links.
  • Build networks as code, troubleshoot with flow logs and a layered checklist, and control network cost.

Syllabus

Prerequisites and the Cloud Network Mental Model

  1. IPv4 Addresses and CIDR Notation
  2. Private Address Ranges and NAT
  3. What the Cloud Virtualises

VPC Foundations

  1. What a VPC Is
  2. Regions, Availability Zones and Subnet Scope
  3. Planning Address Space

Subnets and Route Tables

  1. Public and Private Subnets
  2. Carving and Sizing Subnets
  3. Route Tables and Longest-Prefix Match

Getting In and Out: Internet and NAT Gateways

  1. Internet Gateways and Public IPs
  2. NAT Gateways for Private Subnets
  3. IPv6 in the VPC

Filtering Traffic: Security Groups and Network ACLs

  1. Security Groups
  2. Network ACLs
  3. Designing Rules for a Three-Tier App

Connecting VPCs: Peering, Transit and Shared VPCs

  1. VPC Peering
  2. Transit Gateways and Hub-and-Spoke
  3. Shared VPCs Across Accounts and Projects

Private Service Access and Hybrid Connectivity

  1. VPC Endpoints for Provider Services
  2. Publishing Services with PrivateLink
  3. Hybrid Connectivity: VPN and Dedicated Links

DNS, Load Balancers and Container Networking

  1. DNS Inside a VPC
  2. Load Balancers in the VPC
  3. Kubernetes and IP Address Consumption

Infrastructure as Code and Troubleshooting

  1. Defining a VPC in Terraform
  2. VPC Flow Logs
  3. A Connectivity Troubleshooting Checklist

Security, Cost and Common Pitfalls

  1. Defence in Depth and Egress Control
  2. Understanding Network Cost Drivers
  3. Common Cloud Networking Mistakes

Revision and Interview Prep

  1. Cloud Networking Cheat Sheet
  2. Common Interview and Exam Questions
  3. Mixed Self-Check

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