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Q91. What do you understand by "Scaling Trigger" ?

Ans. It's a configuration for auto scaling environment that specify the attributes / conditions for scaling instances up and down. For example - We may like environment to scale up when the number of requests / sec increases a particular threshold and scale down when it decreases below a threshold.

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_{Like Discuss Correct / Improve AWS Amazon AWS Amazon EC2 Elastic Beanstalk Auto Scaling Scaling Trigger production support}

Q92. How can we know how many instances are currently in service within an Elastic Beanstalk environment ?

Amazon Web Services (AWS)

Ans. We can go to respective environment and check configuration and then scaling. It mentions that as current status like

Current status:

2 instance(s) in service, Min: 1, Max: 4

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Q93. Which components of AWS are you using in your project ?

Amazon Web Services (AWS)

Ans. We are using EC2 and Lambda for computing, RDS for Database , S3 for Storage , SQS and Kinesis for streaming and queue and CloudWatch for monitoring.

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Q94. In a Tree, find common ancestor of two nodes.

Data Structures

^{This question was recently asked at 'Amazon'.This question is still unanswered. Can you please provide an answer.}

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Q95. In a file there are 1 million words . Find 10 most frequent words in that file.

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Q96. Write an efficient program for printing k largest elements in an array. Elements in array can be in any order.

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Q97. What is the difference between Reserved and On Demand instance ?

Amazon Web Services (AWS)

Ans. On demand instance is normal instance means if you create first time so you can use on demand instance, in this instance you can create simple server like 2 gb RAM, 1 core CPU, GP2 30 GB SSD....etc.

and Reserved instance is you can create server and its reserved for 2-3 years and when you give back to this server on AWS they give you discount but on demand and reserved instance price are same.

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_{Like Discuss Correct / Improve AWS Ec2}

Q98. What is EC2 and EC2 instance ?

Amazon Web Services (AWS)

Ans. EC2 is elastics compute cloud is one of the amazon service and ec2 instance is one type of virtual server which you create from AMI.

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Q99. What are the various security and access services provided by AWS ?

Amazon Web Services (AWS)

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Q100. What are some of the computation services provided by AWS ?

Amazon Web Services (AWS)

Ans. EC2, EKS, EKC , Lambda

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Q101. Tell me something about Amazon Lambda.

Amazon Web Services (AWS)

Ans. AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. It is a computing service that runs code in response to events and automatically manages the computing resources required by that code. It was introduced in November 2014.

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Q102. What are some of the storage and database services provided by AWS ?

Amazon Web Services (AWS)

Ans. Storage - S3, Glacier
Database - RDS, DynamoDB

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Q103. Difference between Amazon RDS and Amazon DynamoDB ?

Amazon Web Services (AWS)

Ans. Amazon RDS provides relational database services whereas DynamoDb provide No SQL database services.

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Q104. What is the difference between AWS Gateway API and Lambda ?

Amazon Web Services (AWS)

Ans. AWS API Gateway is the endpoint URI to get invoke. Whereas Lambda is the compute function being invoked from API Gateway or S3 or SNS

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Q105. Can we build web services using AWS Lambda ?

Amazon Web Services (AWS)

Ans. We have to complement it to AWS Gateway API.

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Q106. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q107. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?

Amazon Web Services (AWS)

Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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Q108. Explain how Mark & Sweep is implemented in garbage collection.

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Q109. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q110. What should we do If we need to know the IP of the machine where Lambda function runs ?

Amazon Web Services (AWS)

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Q111. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q112. Find Intersection/union between two arrays.

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_{Like Discuss Correct / Improve arrays code coding Asked in 7 Companies frequent}

Q113. What are you using AWS lambda for ?

Amazon Web Services (AWS)

Ans. We are using it for computation (EC2) , Storage (S3) and Database (RDS)

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Q114. What are you using AWS lambda for ?

Amazon Web Services (AWS)

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Q115. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?

Ans. We can provision more instances for that particular time slot.

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Q116. Why AWS is better than Azure ?

Cloud Computing

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Q117. Have you ever worked on migrating AWS services and databases from one account to another ?

Amazon Web Services (AWS)

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Q118. Do you know how can we export Redis data ?

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Q119. What is Bastion host ?

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_{Like Discuss Correct / Improve Amazon Web Service (AWS)}

Q120. How do you usually choose which type of EC2 Instance you would like to Use ?

Amazon Web Services (AWS)

Ans. Depend on its pricing module

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