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DNS and Network Routing

Route 53

Route 53 is a scalable and highly available DNS web service

  • Managed domain name service (DNS)

  • Used to map IP addresses (142.251.215.238) to domain names (google.com)

  • Can register domain names (mywebsite.com)

  • Used to route traffic ACROSS regions using various routing policies

    • Can be used in combination with elastic load balancers (which route traffic only in a single region)

  • DNS record types

    • A Record: Points a host name to a specific IP address (aws.amazon.com -> 205.251.242.103)
    • CNAME: Points a host name to another name or A Record (amznwebsvcs.mywebsite.com -> aws.amazon.com)
    • Alias: Specific to AWS; points a host name to an AWS resource, such as an S3 static website or a CloudFront distribution

  • Key Features:

    • Domain Registration: Register and manage domain names directly through Route 53
    • DNS Routing Policies:
      • Simple, Weighted, Latency-Based, Geolocation, Geoproximity, Multi-Value Answer, and Failover
    • Health Checks: Monitor application endpoints and route traffic based on health
    • Traffic Flow: Create advanced routing policies using a visual editor
    • Integration with AWS Services: Route traffic to resources like EC2, S3, ELB

  • Use Cases:

    • Load balancing across multiple regions
    • Disaster recovery setups

CloudFront

CloudFront is a globally distributed content delivery network (CDN)

  • Content delivery network (CDN) that's geographically distributed to deliver content faster by caching

  • Commonly used to deliver media files (videos, images)

  • Can be used in conjunction with Route 53

  • Key Features:

    • Edge Locations: Serve content with low latency using over 400 edge locations globally
    • Origin Servers: Distribute content from AWS resources (e.g., S3, EC2) or external HTTP servers
    • Caching: Reduce latency and improve performance with caching at edge locations
    • Security Features:
      • HTTPS support and custom SSL certificates
      • Integration with AWS WAF for web application protection
    • Dynamic and Static Content: Efficiently deliver both dynamic and static assets

  • Use Cases:

    • Accelerating website performance
    • Reducing load on origin servers

Global Accelerator

Global Accelerator improves the performance of global applications by directing user traffic through AWS's global network

  • Uses global network of edge locations to improve speeds for a variety of applications

  • Does not use caching; improvement comes from network routing of traffic (moving off the public internet)

  • Key Features:

    • Static IP Addresses: Use two static IPs as fixed entry points for applications
    • Anycast Routing: Automatically routes traffic to the closest healthy endpoint
    • Health Checks: Actively monitors endpoint health and reroutes traffic as needed
    • Integrations: Works with resources like EC2, ALB, and NLB
    • Failover Support: Ensures high availability with automatic failover

  • Use Cases:

    • Latency-sensitive applications
    • High availability and disaster recovery

Best Practices

  • Use Route 53 for intelligent DNS routing and failover
  • Leverage CloudFront for caching static and dynamic assets to reduce latency
  • Incorporate Global Accelerator for improving network performance and resilience for global users
  • Combine these services to build a scalable, reliable, and efficient architecture