AWS CloudFront, SNS, SQS revision before CSA exam

Quick revision on topics AWS CloudFront, SNS, SQS before appearing AWS Certified Solutions Architect – Associate level exam.

This article notes down few important points about AWS (Amazon Web Services) CloudFront, SNS and SQS. This can be helpful in last minute revision before appearing for AWS Certified Solutions Architect – Associate level certification exam.

This is third part of AWS CSA revision series. Rest of the series listed below :

• AWS CSA revision part I (EC2, S3, RDS)
• AWS CSA revision part II (VPC, Route53, IAM)
• AWS CSA revision part IV (SWF,Beanstalk, EMR, Cloudfomation)

In this article we are checking out key points about CloudFront(CDN Content Delivery Network), SNS (Simple Notification Service) and SQS (Simple Queue Service).

Recommended read : AWS CSA exam preparation guide

Lets get started :

AWS Cloudfront

• Origin can be S3 bucket or cname of Elastic Load Balancer ELB
• S3 bucket as origin. URL will be bucket_name.s3-reagion.cloudfront.net
• Private content sharing with signed URL with expiration time limit
• To serve new object version, create new distribution or create invalidation of old object. Since invalidation costs, creating new distribution always helps.
• Limits :
  • 1,00,000 Requests per second per distribution
  • 200 distributions per account
  • 40Gbps speed per distribution
  • 25 origins per distribution
  • 20 GB max file size to serve
• By default object expiration is 24 hours. Minimum TTL is 0.

Amazon SNS

• Latest addition to SNS is Lambda
• SNS has two clients : Publishers and subscribers
• Publishers communicate to subscribers by sending message to topic.
• Protocol supported :
  • HTTP
  • HTTPS
  • SMS
  • email
  • email-JSON
  • Amazon SQS
  • AWS Lambda
• SNS Topic of same name can be created after 30-60 seconds previous topic deleted.

Amazon SQS

• Default visibility timeout is 30 secs. Maximum is 12 hours.
• Mainly used to decouple your application
• Default period message stays in queue is 4 days. Min-Max periods are 1 min to 2 weeks.
• Maximum SQS message size is 256KB.
• Supports unlimited number of queues and unlimited messages per queue.
• Long polling can be done from 1 to 20 secs.