This topic will cover the basics of cloud networking, including what cloud networking is, its benefits, and how it differs from traditional networking.
Introduction to Cloud Networking
Key concepts, components, and best‑practice guidelines
| Aspect | Description |
|---|---|
| Definition | The design, deployment, and management of network services (routing, switching, security, load balancing, etc.) that run on public, private, or hybrid cloud platforms instead of traditional on‑premises hardware. |
| Goal | Deliver scalable, on‑demand connectivity and network services to applications and users while reducing capital expense and operational complexity. |
| Typical Use Cases | • Multi‑region web‑app deployment • Disaster‑recovery and backup traffic • Secure SaaS integration • Edge computing and IoT connectivity • Hybrid‑cloud data center extension |
| Component | Cloud‑Native Equivalent | Primary Functions |
|---|---|---|
| Virtual Private Cloud (VPC) / Virtual Network (VNet) | AWS VPC, Azure VNet, GCP VPC | Isolated IP address space, subnets, routing tables, security boundaries. |
| Subnets | Public vs. private subnets | Separate workloads (e.g., web tier vs. database tier); control exposure to the internet. |
| Internet Gateway / NAT Gateway | AWS IGW/NAT, Azure Internet Gateway, GCP Cloud NAT | Enable outbound/inbound traffic for public subnets; provide NAT for private subnets. |
| Route Tables | Custom routing rules | Direct traffic between subnets, VPN, peered VPCs, and on‑premises networks. |
| Security Groups & Network ACLs | Stateful vs. stateless firewalls | Instance‑level (SG) and subnet‑level (ACL) traffic filtering. |
| Load Balancers | ALB/NLB, Azure Load Balancer, GCP Cloud Load Balancing | Distribute traffic across instances, support TLS termination, health checks. |
| VPN & Direct Connect / ExpressRoute / Cloud Interconnect | Site‑to‑site IPsec VPN, dedicated private links | Secure, low‑latency connectivity between on‑premises data centers and the cloud. |
| Peering & Transit Gateways | VPC Peering, Transit Gateway, Azure Virtual WAN | Inter‑VPC communication without traffic traversing the public internet. |
| DNS Services | Route 53, Azure DNS, Cloud DNS | Authoritative and private DNS zones, health‑based routing. |
| SD‑WAN Integration | Cloud‑managed WAN overlays | Centralized policy control across multiple branch sites and clouds. |
| Pattern | Description | Typical Scenario |
|---|---|---|
| Single‑Region VPC | One VPC with public & private subnets in a single region. | Small web app, low latency, simple compliance. |
| Multi‑Region VPC with Transit Gateway | Central hub (Transit GW) connects spoke VPCs across regions. | Global SaaS, disaster‑recovery, data locality. |
| Hybrid Cloud (VPN/Direct Connect) | On‑premises network linked via encrypted VPN or dedicated line. | Legacy workloads, data residency, lift‑and‑shift migrations. |
| Multi‑Cloud Mesh | Peered VPCs/VNets across AWS, Azure, GCP using third‑party interconnect or native cloud‑exchange services. | Redundancy, vendor‑agnostic architecture, workload bursting. |
| Edge‑Centric Architecture | Cloud‑based routing + edge locations (CDN, edge compute |