Interview Questions and Answers for 'Amazon' | Search Interview Question

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Q241. Have you ever worked on migrating AWS services and databases from one account to another ?

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Q242. Why AWS is better than Azure ?

Cloud Computing

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Q243. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?

Server

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

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Q244. What are you using AWS lambda for ?

Amazon Web Services (AWS)

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Q245. 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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Q246. Find Intersection/union between two arrays.

Core Java

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Q247. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q248. 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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Q249. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q250. Explain how Mark & Sweep is implemented in garbage collection.

Core Java

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Q251. 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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Q252. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q253. 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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Q254. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.

Amazon Web Services (AWS)

Ans. We can create API gateway and give the name of lambda function in order to be linked with lambda function, deploy the API and whenever request will be made from API it will directly be linked to lambda function to perform further process.

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Q255. What are the problems one could face while working with serverless technologies like AWS Lambda ?

Amazon Web Services (AWS)

Ans. Warm up time for certain technologies like Java ( JVM Warmup )

Performance

Size of Deployable ( Bigger size packaging should go in S3 )

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Q256. 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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Q257. 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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Q258. 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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Q259. 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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Q260. What are some of the computation services provided by AWS ?

Amazon Web Services (AWS)

Ans. EC2, EKS, EKC , Lambda

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Q261. What are the various security and access services provided by AWS ?

Amazon Web Services (AWS)

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Q262. What are the services provided by AWS ?

Amazon Web Services (AWS)

Ans. AWS provides various types of services like Computing ( EC2 , Lambda , EKS ), Storage ( S3, Glacier ), Database ( RDS , DynamoDB ), Streaming ( Kinesis ), Queue ( SQS ), Security and Access ( IAM ) etc.

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Q263. 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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Q264. What are the reasons to choose between reserved and on demand instances ?

Server

Ans. In terms of compute options and configurations, Reserved Instances and On Demand instances are the same. The only difference between the two is that a Reserved Instance is one you rent (reserved) for a fixed duration, and in return you receive a discount on the base price of an On Demand instance.

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Q265. 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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Q266. What is cloud computing ?

Cloud Computing

Ans. Cloud Computing is a way of using IT infrastructure with following traits -

1. On Demand Infrastructure
2. Broad Network Access
3. Resource Pooling
4. Rapid Elasticity
5. Measured Service

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Q267. Write an efficient program for printing k largest elements in an array. Elements in array can be in any order.

Data Structure

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Q268. In a file there are 1 million words . Find 10 most frequent words in that file.

Design

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Q269. In a Tree, find common ancestor of two nodes.

Data Structures

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Q270. 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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