Cloud Networking provides secure and scalable connectivity for cloud resources such as virtual machines, storage, and applications.
It allows you to build private networks, control traffic, and distribute load just like a physical data center — but in the cloud.
Main networking components are:
- Virtual Networks
- Load Balancers
- Firewalls
A Virtual Network (VNet/VPC) is a private network inside the cloud.
- Isolated and secure
- Custom IP address range
- Subnets for organization
- Connects cloud resources
- AWS VPC
- Azure Virtual Network
- Google VPC
- Private application networks
- Hybrid cloud connections
- Secure internal communication
A Load Balancer distributes incoming traffic across multiple servers.
- Improves availability
- Prevents server overload
- Automatically routes traffic
- Supports HTTP, HTTPS, TCP
- AWS Elastic Load Balancer
- Azure Load Balancer
- Google Cloud Load Balancer
- High-traffic websites
- Application scaling
- Fault-tolerant systems
A Firewall controls inbound and outbound network traffic.
- Blocks unauthorized access
- Allows only required ports
- Network-level security
- Application-level filtering
- AWS Security Groups
- Azure Network Security Groups
- Google Firewall Rules
- Server protection
- Network isolation
- Compliance and security
- Create a virtual network (VPC/VNet)
- Create subnets for different tiers (web, app, database)
- Launch servers inside the virtual network
- Configure firewall rules
- Attach load balancer to servers
- Route traffic securely to applications
You want to deploy a highly available web application.
- Network:
my-vpc
- CIDR:
10.0.0.0/16
- Subnets:
- Web subnet:
10.0.1.0/24
- App subnet:
10.0.2.0/24
- Two virtual machines in web subnet
- Private IPs only
- Install web server on both
Allow:
- HTTP (80) from internet
- HTTPS (443) from internet
- SSH (22) only from admin IP
Block:
- All other inbound traffic
- Attach both web servers
- Public IP for load balancer
- Health checks enabled
Open browser:
http://load-balancer-ip
Traffic is automatically distributed between both servers.
- Secure private networking
- High availability
- Automatic traffic management
- Easy scaling
- Enterprise-grade security
Cloud networking uses virtual networks, load balancers, and firewalls to build secure, scalable, and reliable applications.
It provides full control over traffic flow and access management in the cloud.