Cloud networking controls how applications communicate with users, managed services and one another. Although providers use different product names, the core design questions are similar: Which address space will the workload use? Which resources require internet access? Where should traffic be allowed, inspected or blocked?
Understanding these questions is more valuable than memorising a console sequence.
Begin with a virtual network
A virtual private cloud or virtual network is a logically isolated address space. Teams choose an IP range using CIDR notation, such as 10.20.0.0/16, and divide it into smaller subnets.
Plan address ranges before connecting environments. Overlapping networks make peering, VPNs and future expansion difficult. Document reserved ranges for production, testing and shared services.
Design public and private subnets
A public subnet has a route that can reach an internet gateway, but a resource is not automatically public merely because it sits there. It also needs an address and security rules that allow traffic.
Private subnets do not accept direct inbound internet connections. Application servers and databases commonly belong in private subnets. They may use a controlled outbound path, such as a NAT service, to download updates or call external APIs.
“Private†is a routing description, not a complete security guarantee. Identity, firewall and application controls are still required.
Understand route tables
A route table decides where packets go based on destination. Local routes enable communication inside the network. Default routes may send internet-bound traffic to a gateway, inspection appliance or NAT service.
When connectivity fails, trace the path in both directions. Confirm the source and destination addresses, subnet routes, gateways, security policies, DNS and application listener. A successful outbound path does not guarantee a valid return path.
Apply security groups and network ACLs
Security groups or equivalent controls attach to resources or interfaces and define allowed traffic. Use least privilege: permit only the required protocol, port and source. Referencing another application group is often safer than allowing a large IP range.
Network ACLs provide subnet-level rules on some platforms. Their stateful or stateless behaviour differs by control and provider, so understand whether response traffic must be allowed explicitly.
Avoid using network rules as the only trust boundary. Strong identity and application authentication remain necessary.
Plan ingress and load balancing
A public load balancer can accept user traffic and forward it to private application targets. Health checks remove unhealthy targets, while TLS certificates protect traffic. Restrict backend rules so applications accept requests only from the load-balancing layer where the platform supports it.
Internal load balancers serve private applications and service-to-service traffic. Choose them when no public endpoint is required.
Connect other networks
Peering connects virtual networks but may not support transitive routing. Hub-and-spoke or transit services can centralise connectivity and inspection. VPN connections use encrypted tunnels over the internet; dedicated circuits may offer more predictable private connectivity.
DNS is part of the design. Decide how private names resolve across networks and how split public/private records will be managed.
Make observability part of the network
Enable flow logs where appropriate, centralise load-balancer logs and monitor rejected connections. Logs must have retention, access controls and owners. Create alerts for unusual exposure or unexpected traffic volume.
Tag network resources with environment, application and owner. Diagrams should show subnets, routes, gateways and trust boundaries, not just provider icons.
Hands-on project
Build a two-tier practice environment with a public load balancer, private application instances and a private database. Draw the packet path for a user request, software update and administrator connection. Then explain which controls block direct database access.
Learn these components through the Cloud Computing Training in Vizag. Clarify ownership with the cloud shared responsibility model and use the design as a foundation for a hybrid or multi-cloud architecture.
Final takeaway
Reliable cloud networking begins with non-overlapping addresses, intentional subnet roles, clear routes and least-privilege controls. Trace traffic end to end and make logs, DNS and ownership part of the architecture.