What are DynamoDB Streams, and what are their use cases?
Amazon DynamoDB Streams is a feature that captures a time-ordered sequence of item-level changes (inserts, updates, deletes) in your DynamoDB table and stores this information for up to 24 hours.
How do you secure SSH access to your EC2 instances?
Securing SSH access to your Amazon EC2 instances is critical for protecting your infrastructure from unauthorized access. Here are best practices and steps to secure SSH access:
*Use Key Pairs (Disable Password Login),
*Restrict Access with Security Groups,
*Use EC2 Instance Connect or Systems Manager (SSM),
*Use a Bastion Host / Jump Box,
* Rotate SSH Keys Regularly,
*Enable Logging and Monitoring,
*Harden SSH Configuration,
*Keep the OS and Packages Updated.
What is DynamoDB Accelerator (DAX) ?
Amazon DynamoDB Accelerator (DAX) is a fully managed, in-memory cache designed to significantly speed up read performance for DynamoDB tables.
What are some strategies to optimise costs on AWS?
Here are key strategies categorized by domain:
*Right-Sizing and Resource Management,
*Pricing Models,
*Storage Optimization,
*Use Managed Services Wisely,
*Monitoring & Automation,
*Use Free and Low-Cost Tools.