Okay so I will list down all the concepts that you will need to clear AWS CSA examination. I may be brief but I will just jolt down the points one needs to study. Here we go.
Some basic concepts :
AWS has different AZs known as availability zone which are geographically separated. They are data centers which are separated Geo wise. AZs can also help store data in the specific region. Not all AWS services have to be AZ specific like the IAM service.
CloudFront is a CDN by AWS. Caters with fast static file delivery. These files are stored on hundreds to AWS edge locations and can cater as per user affinity.
Scalability is cloud’s ability to expand\contract as per demand. Why would you pay for 10 servers when you are using 10 servers only at a peak time and like 4 servers at non-peak time. Thats where scalability comes into play. Elasticity is kind of same : scale up and scale down as per need as per work load. Now S3 is highly fault tolerant but EC2 is not. There are two types of scaling :
Proactive cycle scaling : scaling up at peak time.
Proactive event scaling : scaling up with anticipated demand.
Auto scaling : based on metrics like CPU\Network utilization.
Fault tolerance is ability of our system to recover\continue operating in event of failures.Fault tolerance can make use of auto-scaling, Route 53, AZ, Multiple regions. When designing fault tolerant operations, your aim should be to design an App which is designed with failures in mind.
There are many AWS services primarily grouped as,
Compute & Networking, Storange and Content Delivery, DB, Analytics, App services, Deployment services, Management services.
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