AWS Certified Cloud Practitioner Series – Part 2

Security, Storage, Scaling, and High Availability in AWS In this article, I continue my AWS Certified Cloud Practitioner learning series by covering core AWS compute, storage, networking security, scalability, and availability concepts. These topics are extremely important from both exam and real‑world DevOps perspectives. Security Groups Security Groups act as virtual firewalls that control inbound and outbound traffic for EC2 instances. Inbound Rules Allowing HTTP (TCP 80) from anywhere (0.0.0.0/0) enables users to view an EC2 instance in a web browser. If a Security Group is misconfigured, a timeout error typically occurs when trying to access the instance. Outbound Rules By default, outbound rules allow IPv4 – All Traffic. This configuration gives the EC2 instance full outbound connectivity to anywhere. SSH Access Port 22 (SSH) from anywhere is required to connect to the instance using any of the four AWS-supported connection methods after clicking Connect. Amazon EBS (Elastic Bloc