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Q211. Difference between AWS Cloud Formation and AWS AMI ?

Amazon Web Services (AWS)

Ans. AMI is an Amazon Machine Image. It contains the configuration to enable to boot up an EC2 instance with said configuration whereas Cloud formation is a templating language that allows to describe how to build a VPC and also allows you to create AWS services

AMI is templating specific to instances whereas the scope of CloudFormation templating is much bigger. CloudFormation could use AMI for launching instances along with other services.

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Q212. How is a WAF different from ip tables ?

Amazon Web Services (AWS)

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Q213. You have a webserver on an ec2 instance. Your instance can get to the internet, but nobody on the internet can get to your webserver. Describe how you would troubleshoot.

Amazon Web Services (AWS)

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Q214. Design an e commerce application using AWS ? What AWS services will you use ?

Amazon Web Services (AWS)

Ans. CloudFront for Static Media and cached content
EC2 and EKS ( Docker ) for main application computing
RDS and DynamoDB for Database
Lambda ( computing ) for running back end cron jobs
Kinesis for streaming and SQS for queuing
CloudWatch for Monitoring
CloudFormation for Infrastructure templating
S3 for Object Storage

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Q215. How does AWS Lambda handle failure during event processing?

Amazon Web Services (AWS)

Ans. In AWS Lambda we can run a function in synchronous or asynchronous mode. In synchronous mode, if AWS Lambda function fails, then it will just give an exception to the calling application. In asynchronous mode, if AWS Lambda function fails then it will retry the same function at least 3 times.If AWS Lambda is running in response to an event in Amazon DynamoDB or Amazon Kinesis, then the event will be retried till the Lambda function succeeds or the data expires. In DynamoDB or Kinesis, AWS maintains data for at least 24 hours.

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Q216. What are the different types of load balancing options provided by Amazon Elastic Load Balancing (ELB)?

Amazon Web Services (AWS)

Ans. Application load balancing
Network load balancing
Classic load balancing

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Q217. What is AWS Snowball?

Amazon Web Services (AWS)

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Q218. What is Geo Targeting in Amazon CloudFront?

Amazon Web Services (AWS)

Ans. Geo Targeting will the users country of origin and pass along with country code to you in the cloudFront viewer country header.

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Q219. What are the different types of actions in Object Lifecycle Management in Amazon S3?

Amazon Web Services (AWS)

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Q220. Can we do Cross Region replication in Amazon S3 without enabling versioning on a bucket?

Amazon Web Services (AWS)

Ans. Yes

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Q221. What is the use of Amazon Glacier?

Amazon Web Services (AWS)

Ans. Its a storage option provided by AWS which is even cheaper than S3. As the objects are archieved before saving, retrieval time is pretty bad.

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Q222. How will you upload a file greater than 100 megabytes in Amazon S3?

Amazon Web Services (AWS)

Ans. AWS now allows file upto 5GB in S3

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Q223. What is the scale of durability in Amazon S3?

Amazon Web Services (AWS)

Ans. 99.999999999%

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Q224. What is the default limit on number of EC2 instances in each region ?

Amazon Web Services (AWS)

Ans. 20

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Q225. Which ELB component is responsible for monitoring the Load Balancers?

Amazon Web Services (AWS)

Ans. Controller Service

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Q226. What are the IP address mechanisms supported by ELB?

Amazon Web Services (AWS)

Ans. IPv4 and IPv6

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Q227. Which AWS service is a task coordinator and state management service for cloud applications.

Amazon Web Services (AWS)

Ans. Amazon SWF

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Q228. 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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Q229. 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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Q230. What is the cost of using Cloud Formation ?

Amazon Web Services (AWS)

Ans. Cloud Formation does not have any additional cost but you are charged for the underlying resources it builds.

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Q231. How many requests per second can Amazon CloudFront handle?

Amazon Web Services (AWS)

Ans. 10000

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Q232. 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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Q233. 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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Q234. 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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Q235. 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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Q236. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q237. 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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Q238. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

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Q239. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?

Amazon Web Services (AWS)

Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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Q240. 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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