j-mprabhakaran/AWSPointsToRemember

## AWSPointsToRemember
1. In AWS batch, you are able to specify minimum, maximum and desired number of CPU's.
2. Amazon EBS-backed EC2 instances boot faster than instance store-backed instances.
3. The operating system offered in Amazon Light sail are Amazon Linux and Ubuntu.
4. AWS Elastic beanstalk is used to spin up infrastructure that is both externally facing and internally facing.
5. SSD-backed Amazon EBS gives you low latency.
6. AWS can only create latency record sets in the AWS region, not in customer location.
7. The only routing protocol that AWS Direct Connect supports is BGP.
8. A private VIF is the logical interface between your on-premises network and AWS resource located in VPC.
9. Cloud front will forward a file to a user as soon as it get it's first bytes. It does no error checking.
10. Origin access identity (OAI) is used to restrict access to your Amazon S3 content.
11. AWS DynamoDB is replicated across availability zones in an AWS region automatically.
12. To increase performance, Amazon redshift uses techniques such as columnar storage, data compression, zone maps to reduce the amount of I/O needed to perform queries.
13. Public sharing can only happen on unencrypted volumes.
14. Amazon EFS can also connect to on premises Linux servers through AWS direct connect.
15. Resources are the required section in an AWS cloud formation templates.
16. AWS cloud formation, Opsworks and code deploy supports Blue/Green deployment.
17. Amazon Route53 sends one minute metrics to cloud watch.
18. Read replica are not a replacement for the high availability and automatic fail over capabilities that multi AZ configuration provides.
19. AWS DynamoDB supports eventually consistent and strongly consistent reads.
20. When deploying an AWS Lambda function, 1.5 GB is the maximum memory that can be allocated to a single function.
21. Customers can run an agent on their Amazon EC2 instances to pass OS logs to CloudWatch Logs.
22. Network access control lists can allow and deny network traffic based on the source or target IP address and port number.
23. Amazon SQS encrypts data at rest and Amazon SNS doesn't encrypts data at rest.
24. A default Amazon VPC has a network of /20. It comes with an Internet gateway and route table reflecting that Internet Gateway.
25. Any EBS volume can only be mounted to one Amazon EC2 instance at a time.
26. AWS OpsWorks Stacks can be used to connect to a back-end database such as Amazon DynamoDB.
27. Cross region replication is a bucket-level feature that enables automatic, asynchronous copying of objects across buckets in different AWS regions.
28. AWS has no visibility above the hypervisor.  You need to create a custom CloudWatch metric to monitor memory usages.
29. Amazon RDS and Amazon Redshift both include the ability to take snapshots of data automatically and store them, durably in Amazon S3.
30. A Read replica DB instance (MySQL, MariaDB and PostgreSQL) is lag behind with an amount of time from its source DB instance.
31. When there are multiple security groups associated with an instance, all the rules are aggregated.
32. A DHCP option set allows customers to define DNS servers for DNS name resolution, establish domain names for instances within an Amazon VPC, define NTP servers and define the NetBIOS name servers.
33. When Amazon Ec2 instances fail the requisite number of consecutive health checks, the load balancer stops sending traffic to the Amazon EC2 instance.
34. An Elastic Load Balancing health check may be a ping, a connection attempt or a page that is checked.
35. General purpose SSD volumes are generally the right choice for databases that have bursts of activity.
36. Origin access identifiers and signed URLs support serving private content from Amazon CloudFront.
37. Simple Active Directory is a Microsoft Active Directory-compatible directory that is powered by Samba 4.
38. AWS KMS uses envelope encryption to protect data.
39. Amazon WorkSpace uses PCoIP, which provides an interactive video stream without transmitting actual data.
40. Amazon Cognito Identity supports public identity providers- Facebook, Amazon and Google as well as unauthenticated identities.
	1. In AWS batch, you are able to specify minimum, maximum and desired number of CPU's.
	2. Amazon EBS-backed EC2 instances boot faster than instance store-backed instances.
	3. The operating system offered in Amazon Light sail are Amazon Linux and Ubuntu.
	4. AWS Elastic beanstalk is used to spin up infrastructure that is both externally facing and internally facing.
	5. SSD-backed Amazon EBS gives you low latency.
	6. AWS can only create latency record sets in the AWS region, not in customer location.
	7. The only routing protocol that AWS Direct Connect supports is BGP.
	8. A private VIF is the logical interface between your on-premises network and AWS resource located in VPC.
	9. Cloud front will forward a file to a user as soon as it get it's first bytes. It does no error checking.
	10. Origin access identity (OAI) is used to restrict access to your Amazon S3 content.
	11. AWS DynamoDB is replicated across availability zones in an AWS region automatically.
	12. To increase performance, Amazon redshift uses techniques such as columnar storage, data compression, zone maps to reduce the amount of I/O needed to perform queries.
	13. Public sharing can only happen on unencrypted volumes.
	14. Amazon EFS can also connect to on premises Linux servers through AWS direct connect.
	15. Resources are the required section in an AWS cloud formation templates.
	16. AWS cloud formation, Opsworks and code deploy supports Blue/Green deployment.
	17. Amazon Route53 sends one minute metrics to cloud watch.
	18. Read replica are not a replacement for the high availability and automatic fail over capabilities that multi AZ configuration provides.
	19. AWS DynamoDB supports eventually consistent and strongly consistent reads.
	20. When deploying an AWS Lambda function, 1.5 GB is the maximum memory that can be allocated to a single function.
	21. Customers can run an agent on their Amazon EC2 instances to pass OS logs to CloudWatch Logs.
	22. Network access control lists can allow and deny network traffic based on the source or target IP address and port number.
	23. Amazon SQS encrypts data at rest and Amazon SNS doesn't encrypts data at rest.
	24. A default Amazon VPC has a network of /20. It comes with an Internet gateway and route table reflecting that Internet Gateway.
	25. Any EBS volume can only be mounted to one Amazon EC2 instance at a time.
	26. AWS OpsWorks Stacks can be used to connect to a back-end database such as Amazon DynamoDB.
	27. Cross region replication is a bucket-level feature that enables automatic, asynchronous copying of objects across buckets in different AWS regions.
	28. AWS has no visibility above the hypervisor. You need to create a custom CloudWatch metric to monitor memory usages.
	29. Amazon RDS and Amazon Redshift both include the ability to take snapshots of data automatically and store them, durably in Amazon S3.
	30. A Read replica DB instance (MySQL, MariaDB and PostgreSQL) is lag behind with an amount of time from its source DB instance.
	31. When there are multiple security groups associated with an instance, all the rules are aggregated.
	32. A DHCP option set allows customers to define DNS servers for DNS name resolution, establish domain names for instances within an Amazon VPC, define NTP servers and define the NetBIOS name servers.
	33. When Amazon Ec2 instances fail the requisite number of consecutive health checks, the load balancer stops sending traffic to the Amazon EC2 instance.
	34. An Elastic Load Balancing health check may be a ping, a connection attempt or a page that is checked.
	35. General purpose SSD volumes are generally the right choice for databases that have bursts of activity.
	36. Origin access identifiers and signed URLs support serving private content from Amazon CloudFront.
	37. Simple Active Directory is a Microsoft Active Directory-compatible directory that is powered by Samba 4.
	38. AWS KMS uses envelope encryption to protect data.
	39. Amazon WorkSpace uses PCoIP, which provides an interactive video stream without transmitting actual data.
	40. Amazon Cognito Identity supports public identity providers- Facebook, Amazon and Google as well as unauthenticated identities.