Networking and Request Paths
The question for this group
How does a request reach the right service, and where can it stop?
Learn to draw the request path and distinguish access from reachability.
Topics to explore
- Addressing: IP addresses, CIDR ranges, ports, DNS records, and Route 53.
- VPC layout: public and private subnets, route tables, internet gateways, and NAT.
- Network controls: security groups, network ACLs, ingress, egress, and VPC endpoints.
- HTTPS: certificates, AWS Certificate Manager, TLS termination, and certificate renewal.
- Traffic routing: reverse proxies, Application Load Balancers, target groups, and health checks.
- Diagnosis: DNS failure, connection timeout, refused connections, TLS errors, CORS, and VPC Flow Logs.
Practice target
Draw browser-to-service traffic and trace one failed request. Predict the result of a route or security-group change before trying it.