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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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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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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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Q121. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

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Q122. How can we make an S3 file public through Java program ?

Amazon Web Services (AWS)

Ans. We can get the object and then can set CannedAcl property as "PublicRead"

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Q123. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q124. Have you ever changed IAM policy ?

Amazon Web Services (AWS)

Ans. Yes I did it for an execution role of a Lambda function to give it write access on S3 bucket.

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Q125. A customer has a website which is accessible over the Internet and he wants to secure the communication and decides to implement HTTPS instead of HTTP. He has configured EC2 instance behind an ELB. Where should you configure the SSL certificate?

Amazon Web Services (AWS)

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Q126. With regards to VPC, what is the default maximum number of virtual private gateways allowed per region?

Amazon Web Services (AWS)

Ans. 5

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Q127. What is elasticity in relation to Cloud infrastructure ?

Cloud Computing

Ans. The power to scale computing resources up and down easily with minimal friction

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Q128. How many requests per second can Amazon CloudFront handle?

Amazon Web Services (AWS)

Ans. 10000

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Q129. What is the objective of enabling versioning on a s3 bucket ?

Amazon Web Services (AWS)

Ans. So that it doesn't overwrite the existing file with the same name and maintain versioning of it.

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Q130. Which IAM policy condition key should be used if you want to check whether the request was sent using SSL?

Amazon Web Services (AWS)

Ans. AWS: secure transport

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