Networking Services
Cloud networking connects your resources securely, distributes traffic, and delivers content to users worldwide. Understanding these services is crucial for building reliable architectures.
Cloud Networking Overview
┌────────────────────────────────────────────────────────┐
│ CLOUD NETWORKING │
│ │
│ Internet │
│ │ │
│ ▼ │
│ ┌──────────┐ ┌──────────┐ ┌──────────────────┐ │
│ │ CDN │──▶│ ALB │──▶│ VPC │ │
│ │CloudFront│ │ Load │ │ ┌────────────┐ │ │
│ │ │ │ Balancer│ │ │ Subnet │ │ │
│ │ Cache │ │ Distrib.│ │ │ ┌────────┐ │ │ │
│ │ closer │ │ traffic │ │ │ │ EC2 │ │ │ │
│ │ to users │ │ evenly │ │ │ └────────┘ │ │ │
│ └──────────┘ └──────────┘ │ └────────────┘ │ │
│ │ ┌────────────┐ │ │
│ │ │ Subnet │ │ │
│ │ │ ┌────────┐ │ │ │
│ │ │ │ RDS │ │ │ │
│ │ │ └────────┘ │ │ │
│ │ └────────────┘ │ │
│ └──────────────────┘ │
└────────────────────────────────────────────────────────┘
VPC — Virtual Private Cloud
A VPC is your own isolated network in the cloud. You define IP address ranges, subnets, route tables, and network gateways. It's like having your own data center in the cloud with complete control over network configuration.
Key components: Subnets (public/private), Internet Gateway, NAT Gateway, Route Tables, Security Groups, Network ACLs.
Load Balancers
Load balancers distribute incoming traffic across multiple targets (EC2 instances, containers, IPs). They improve availability and fault tolerance automatically.
ALB (Application Layer): Routes based on HTTP content — ideal for web apps, microservices, and containerized workloads.
NLB (Network Layer): Routes based on IP protocol data — ultra-low latency for TCP/UDP workloads like gaming and IoT.
CDN — Content Delivery Network
CDNs cache your content at edge locations worldwide, so users get fast access regardless of their location. AWS CloudFront, Azure CDN, and Cloud CDN all provide this service.
Without CDN: With CDN:
┌──────┐ ┌──────┐
│ User │──────▶ Origin │ User │──▶ Edge Cache (nearby)
│ Tokyo│ (US East) │ Tokyo│ │
└──────┘ 200ms latency └──────┘ ▼
Origin (US East)
20ms latency
Cache hit: <10ms
Best Practices
Use public subnets for internet-facing resources and private subnets for databases and internal services. Implement security groups as firewalls. Use NACLs for subnet-level protection. Always design for multi-AZ deployment.