Certification Tips
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AWS PRICING
AWS Data transfer charges:
​Traffic that crosses a Regional boundary will typically incur a data transfer charge. Avoid cross-Region data transfer unless your business case requires it.
IAM
A session policy is a policy that you can pass in the session during an IAM role assumption to further scope the permissions of the IAM role session.
Cognito
Amazon Cognito helps create unique identifiers for end users that are kept consistent across devices and platforms.
DynamoDB
Amazon DynamoDB transactions provide developers atomicity, consistency, isolation, and durability (ACID) across one or more tables within a single AWS account and region.
Lambda
AWS Lambda now comes with 1ms billing granularity for duration of execution time. This directly helps in saving cost but is also motivating to optimise functions that are currently billed below 100ms as well.
S3
S3 objects can range from 0 bytes to 5TB.
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The largest object that can be uploaded in single PUT is 5GB. For objects larger than 100 MB, it is recommended to use multipart upload.
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S3 delivers strong read-after-write consistency.
CloudFront
Amazon CloudFront is a web service that gives businesses and web application developers an easy and cost effective way to distribute content with low latency and high data transfer speeds.
EC2
The keys that Amazon EC2 uses are:
2048-bit SSH-2 RSA keys.
EBS
AWS EBS volumes type (io1) are designed to deliver 99.9% durability, which is 20x more reliable than typical commodity disk drives.
AWS Infrastructure
AWS now spans 77 Availability Zones within 24 geographic regions around the world. Additionally, AWS has plans for 9 more Availability Zones and 3 more AWS Regions.
AWS Pricing
Your AWS costs are driven by:
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Type of the compute provisioned
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Amount of storage consumed
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Amount of outbound data transferred
Note: In most cases, inbound data transfer is not charged by AWS.
EFS
Amazon EFS provides scalable file storage for use with Amazon EC2. You can use an EFS file system as a common data source for workloads and applications running on multiple instances.
FSx
Amazon FSx for Windows File Server provides fully managed Microsoft Windows file servers. Amazon FSx has native support for Windows file system features and for the industry-standard Server Message Block (SMB) protocol to access file storage over a network.
Secrets Manager
AWS Secrets Manager enables you to replace hardcoded credentials in your code, including passwords, with an API call to Secrets Manager to retrieve the secret programmatically.
KMS
AWS KMS multi-Region keys are designed to simplify management of client-side encryption when encrypted data has to be copied into other AWS regions for disaster recovery.
Athena
Amazon Athena is an interactive query service that makes it easy to analyze data in S3 using standard SQL queries. You don’t need to load your data into Athena, it works directly with data stored in any S3 storage class.
Redshift
Redshift Spectrum is a feature of Redshift that enables you to run queries against exabytes of unstructured data in S3 with no loading or ETL required. Redshift Spectrum gives you the freedom to store your data where you want, in the format you want, and have it available for processing when you need it.
RDS
Amazon RDS support RDS Storage Auto Scaling. RDS Storage Auto Scaling automatically scales storage capacity in response to growing database workloads, with zero downtime.
Aurora
Amazon Aurora multi-master cluster configuration ensures database is continuously available. This results in no downtime for the database not even during failover.