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Cloud Networking Basics

Table of Contents

  1. Introduction
  2. What is Cloud Networking?
  3. Virtual Private Cloud (VPC)
  4. Networking in AWS
  5. Networking in Azure
  6. Networking in GCP
  7. Security Considerations
  8. Resources
  9. Conclusion

Introduction

Cloud networking enables communication between resources in cloud environments. It provides flexibility, scalability, and isolation for applications deployed in AWS, Azure, and GCP. Understanding cloud networking concepts like VPCs, subnets, and peering is essential for designing secure and efficient cloud architectures.

What is Cloud Networking?

Cloud networking involves connecting cloud resources such as virtual machines, containers, and storage while controlling traffic flow, security, and accessibility. Cloud providers offer software-defined networking (SDN) tools to configure networks efficiently without physical hardware.

Virtual Private Cloud (VPC)

A VPC is a logically isolated section of the cloud where you can launch resources in a secure, configurable network environment.

Subnets

  • Subnets divide a VPC into smaller segments.
  • Can be public (accessible from the internet) or private (internal-only).
  • Each subnet has its CIDR block defining its IP address range.

Routing and Internet Gateways

  • Route tables define how traffic flows within a VPC or to external networks.
  • Internet Gateways (IGW) allow communication between VPC resources and the internet.
  • NAT Gateways enable private subnets to access the internet securely.

VPC Peering

  • VPC Peering connects two VPCs, allowing resources in one VPC to communicate with another.
  • Traffic remains private and does not traverse the public internet.
  • Common in multi-account or multi-region architectures.

Networking in AWS

  • AWS uses VPCs as the primary networking construct.
  • Features include subnets, route tables, security groups, network ACLs, peering, and transit gateways.
  • Supports elastic IPs, private IPs, and VPN connectivity.
  • Reference: AWS VPC Guide

Networking in Azure

  • Azure uses Virtual Networks (VNets), which are conceptually similar to VPCs.
  • Supports subnets, route tables, Network Security Groups (NSG), peering, VPNs, and ExpressRoute.
  • Enables integration with on-premises networks.
  • Documentation: Azure Virtual Network

Networking in GCP

  • GCP uses Virtual Private Cloud (VPC) networks.
  • Features include subnets (auto or custom), firewall rules, routes, peering, VPN, and Cloud NAT.
  • Global VPCs allow multi-region deployments with centralized management.
  • Reference: GCP VPC Documentation

Security Considerations

  • Use firewalls/security groups to restrict access.
  • Deploy private subnets for sensitive workloads.
  • Encrypt traffic between VPCs and on-premises networks.
  • Monitor and log traffic with cloud-native tools like CloudWatch, Azure Monitor, or Stackdriver.

Resources

Conclusion

Cloud networking is essential for designing scalable, secure, and efficient cloud architectures. Understanding VPCs, subnets, routing, and peering across AWS, Azure, and GCP allows administrators and developers to build robust applications while maintaining performance and security.