Chapter 1: Networking Fundamentals
1.1 Why networking matters in the cloud
When you type http://13.233.10.25 in a browser, your laptop must know which machine to contact (the IP address) and which program on that machine should answer (the port). On AWS you will constantly:
- open or close ports in security groups (e.g. allow 22 for SSH, 80 for HTTP),
- choose CIDR ranges for VPCs and subnets (e.g.
10.0.0.0/16), - decide between public and private IP addresses,
- attach an Elastic IP so your server's address does not change.