Networking and Content Delivery Services

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You can download these notes as pdf from here.

Isolation: Enables you to launch AWS resources into a virtual network that you've defined.
Subnets: Divide your VPC into public and private subnets across different Availability Zones.
Route Tables: Control the routing of traffic within the VPC and to the outside world.
Internet Gateway (IGW): Allows communication between instances in your VPC and the internet.
NAT Gateway: Allows instances in a private subnet to connect to the internet or other AWS services, but prevents the internet from initiating a connection with those instances.
Security Groups and Network ACLs: Provide stateful and stateless traffic filtering, respectively, to control inbound and outbound traffic at the instance and subnet levels.

Content Delivery Network (CDN): Distributes content globally with low latency and high transfer speeds.
Edge Locations: Over 200 globally, cache copies of your content to improve access speed.
Origin Servers: Source of the original content (e.g., S3 buckets, HTTP servers).
Distribution Types: Web distributions (for web content) and RTMP distributions (for media streaming).
Security: Supports SSL/TLS, signed URLs, and signed cookies for secure content delivery.

DNS Service: Highly available and scalable Domain Name System (DNS) web service.
Routing Policies: Various routing policies including simple, weighted, latency-based, failover, geolocation, and multi-value answer.
Health Checks: Monitors the health and performance of your applications, with automatic failover to healthy endpoints.

Load Balancing Types: Includes Application Load Balancer (ALB), Network Load Balancer (NLB), and Classic Load Balancer (CLB).
High Availability: Distributes incoming application traffic across multiple targets, such as EC2 instances, containers, and IP addresses in multiple Availability Zones.
Health Checks: Automatically monitors the health of registered targets and only routes traffic to healthy instances.
Security Features: Integrates with AWS Certificate Manager (ACM) for SSL/TLS termination, and supports end-to-end encryption.

Network Security: Implement security groups and NACLs, use VPC Flow Logs for monitoring and troubleshooting.
Subnet Design: Use public subnets for resources that need to be accessible from the internet and private subnets for resources that should not be directly accessible from the internet.
High Availability: Distribute resources across multiple Availability Zones, use Route 53 for DNS failover, and CloudFront for global content delivery.
Latency Optimization: Use CloudFront for caching and accelerating content delivery, Global Accelerator for routing traffic to optimal endpoints, and latency-based routing in Route 53.
Cost Management: Monitor data transfer costs, choose appropriate VPC endpoints to reduce NAT Gateway costs, and leverage AWS Direct Connect for consistent and cost-effective network performance.
Monitoring and Logging: Use VPC Flow Logs, CloudWatch, and CloudTrail to monitor and log network traffic and events for security and performance analysis.
Data Protection: Use encryption for data in transit, secure VPCs with appropriate firewall rules, and isolate sensitive data in private subnets.

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