Building Connected Architectures: Key Takeaways from AWS Academy Module 5
A breakdown of AWS Academy Module 5: Networking and Content Delivery—exploring Virtual Private Clouds (VPCs), public vs. private subnets, security controls, and global routing.
After mastering AWS Security and IAM in Module 4, Module 5 shifts focus to the virtual network infrastructure that connects these services safely. In cloud computing, a misconfigured network can compromise your entire architecture, so understanding AWS networking fundamentals is essential.
Here are my top 3 takeaways from this networking module:
- Designing Your Virtual Private Cloud (VPC)
An Amazon VPC is your isolated, private virtual network inside the AWS Cloud.
IP Addressing (CIDR Blocks): You define your VPC's IP address range using Classless Inter-Domain Routing (CIDR) notation.
Subnets: You divide your VPC into smaller network segments called subnets:
Public Subnets: Connected to an Internet Gateway (IGW), allowing resources (like web servers) to communicate with the internet directly.
Private Subnets: Isolated from direct internet access, making them ideal for sensitive workloads like databases or backend microservices.
- Dual-Layer Network Security: Security Groups vs. NACLs
AWS provides two complementary layers of defense for network traffic control:
Security Groups (Instance Level): Act as stateful virtual firewalls for your instances. If you allow inbound traffic on port 80 (HTTP), outbound response traffic is automatically allowed.
Network Access Control Lists / NACLs (Subnet Level): Act as stateless firewalls protecting the entire subnet. They require separate rules for both inbound and outbound traffic and support explicit "Deny" rules.
- Route 53 and Global Content Delivery
Amazon Route 53: AWS’s highly available Domain Name System (DNS) web service that routes user requests to cloud resources, supports health checks, and manages failover.
Amazon CloudFront: Works alongside VPCs and Route 53 as a global Content Delivery Network (CDN) to cache dynamic and static content at Edge Locations worldwide, minimizing latency for end users.
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