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 Q31. 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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   Like         Discuss         Correct / Improve     aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda

 Q32. What does AMI include ?Amazon Web Services (AWS)
Ans. A template for the instance.

Launch permission decisions

A block device mapping, when an instance is launched it determines the volumes to attach to that instances.


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   Like         Discuss         Correct / Improve     aws ami  amazon ami

 Q33. Why is cloud infrastructure so powerful ?Cloud Computing
Ans. Because it gives the ability to provision infrastructure on Demand with No contracts and strings attached.

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   Like         Discuss         Correct / Improve     Amazon Web Service (AWS)   Google Cloud Platform (GCP)

 Q34. Which region is the latest and most popular in AWS ? What are the advantages and disadvantages of using this region ?Amazon Web Services (AWS)
Ans. US-East Virginia

This is the oldest and most popular region. All new features are rolled first in this region and hence they are first available there. The downside is that because of experimentation with new services, unavailability time is quite high.

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   Like         Discuss         Correct / Improve     aws region  aws us-east-1

 Q35. What are the advantage of having Edge Locations ?Amazon Web Services (AWS)
Ans. It saves Network traffic and facilitates faster delivery by hosting bulk media and cached data near to client.

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 Q36. What does effect , action and resource means with respect to AWS IAM policy ?Amazon Web Services (AWS)
Ans. effect means whether the effect of this Policy is to allow or deny, action means the type of action ( read , write ) and service, and resource is the resource where this should apply.

For example - If we want to have a Policy of providing read access on S3 ,
effect will be "allow"
action will be "s3:GetObject"
resource will be "arn:aws:s3:::examplebucket/*"

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   Like         Discuss         Correct / Improve     aws iam  amazon iam

 Q37. Within AWS S3, Why new files are available immediately for read operation but not the updates ? Amazon Web Services (AWS)
Ans. Because new files will be fed from where ever they are first available but AWS have no way to identify which is the most updated version among the various regions. The updated version can only be assured once the replication to all availability zones is complete.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q38. What kind of Access Policy should be kept on S3 Buckets and Policy ?Amazon Web Services (AWS)
Ans. We should only allow access that's needed. So the security Policy should be as restrictive as possible.

Buckets and Files should never be made public unless until they are needed it to be like that.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q39. How can we protect from accidental deletes in S3 ?Amazon Web Services (AWS)
Ans. Versioning ( will create Delete marker )
MFA Delete ( authentication upon deletion )
Cross Region Replication ( Replicates aren't deleted )

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3

 Q40. How can we restrict CloudFront access to a particular Geography ?Amazon Web Services (AWS)
Ans. We can select the appropriate Price Class if that suits us.

We can do Geo Targeting by black listing / white listing certain geographies.

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   Like         Discuss         Correct / Improve     aws cloudfront  amazon cloudfront

 Q41. What is the use case for "On Demand" EC2 ?Amazon Web Services (AWS)
Ans. If the computation required is Spiky and unpredictable.

If it's first time use.

If the lifespan of the application isn't known.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q42. What is the use case for "Spot" EC2 plan ?Amazon Web Services (AWS)
Ans. If the usage is non continuous and have flexible start and End Time. For ex - Analysis , Research , mining etc.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2 spot

 Q43. What are the different price options available for EC2 ?Amazon Web Services (AWS)
Ans. On Demand
Reserved
Spot
Dedicated Host

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 Q44. What EC2 configuration would you use if you have to use it for Bitcoin mining ?Amazon Web Services (AWS)
Ans. Keeping Low cost for processing , i would choose

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q45. Which AWS services would you use if you have find a cheapest solution for an analytics application ?Amazon Web Services (AWS)
Ans. Computation

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

Storage

S3-IA

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   Like         Discuss         Correct / Improve     aws computation  aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q46. Can a EC2 instance have multiple Security Groups ? Can a single security group be assigned to multiple Ec2 instances ? If either of them is true , doesn't it result in conflict ?Amazon Web Services (AWS)
Ans. We can assign multiple security groups to single instance and we can use single security group with multiple instances.

It never results in conflict as security groups only have allow rules and no deny rules. Multiple security groups for an instance results in union of all rules.

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2  aws security group

 Q47. Can we deny access for particular IP using Security Groups ?Amazon Web Services (AWS)
Ans. No, We can do that through ACL

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   Like         Discuss         Correct / Improve     aws security group

 Q48. Difference between S3 and EFS ?Amazon Web Services (AWS)
Ans. S3 is object based whereas EFS is block based.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3  aws efs

 Q49. There is a server which is 90% full, I need to increase the space. How can I do it ?Server
Ans. Firstly ,we have removed old backup data from server after that we are checking which user consume high memory through df command.

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   Like         Discuss         Correct / Improve     server  Amazon Web Service (AWS)  production support     Asked in 1 Companies

 Q50. Is tomcat an application or Web server ?Server
Ans. Tomcat is a web server and a Servlet container. It is often used as an application server for web-based applications but does not include the complete suite of capabilities that a Java EE application server would supply.

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   Like         Discuss         Correct / Improve     tomcat   j2ee   web server   application server   build management

 Q51. What is meant by an "asynchronous event." Give some examples ?Operating System
Ans. An asynchronous event is one that occurs at an unpredictable time outside the control of the program that the CPU is running. It is not "synchronized" with the program.

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   Like         Discuss         Correct / Improve     j2ee   internet   web application   asynchronus   asynchronus communication   architecture     Asked in 1 Companies

 Q52. Can we have multiple servlets in a web application and How can we do that ?Java EE
Ans. Yes by making entries in web.xml

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   Like         Discuss         Correct / Improve     j2ee   servlets   servelets   web application   java   web.xml   yes-no   architecture

 Q53. How can we manage Error Messages in the web application ?Solution
Ans. Within message.properties file.

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   Like         Discuss         Correct / Improve     j2ee   web application   struts   spring     Asked in 1 Companies

 Q54. What bean scopes does Spring support? Explain them.Spring
Ans. The Spring Framework supports following five scopes -

Singleton
prototype
request
session
global-session

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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   beans   beans scope   at&t  fidelity

 Q55. What are different types of cookies ?Java EE
Ans. Session cookies , which are deleted once the session is over.

Permanent cookies , which stays at client PC even if the session is disconnected.

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   Like         Discuss         Correct / Improve     j2ee   servlets   session   session management   web applications   cookies   httpsession

 Q56. How to access a Web Element if there are many elements with the same XPath ?
Ans. By specifying the Index like

//button[@class='button'])[2]

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   Like         Discuss         Correct / Improve     selenium   selenium webdriver   automation testing

 Q57. What is a Webdriver ?Testing
Ans. Selenium WebDriver is a tool for automating web application testing.It helps in replicating the manual tester behavior like keyboard entry, mouse events etc and then matching the output against the expected.

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   Like         Discuss         Correct / Improve     selenium  webdriver     Asked in 37 Companies

 Q58. What is Amazon S3 ?Amazon Web Services (AWS)
Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

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   Like         Discuss         Correct / Improve     aws  amazon s3  aws s3  aws storage  amazon cloud storage  amazon s3     Asked in 12 Companies

 Q59. In which cases using SOAP is preferred over REST ?Web Service
Ans. SOAP services are better in case we need to establish a formal and detail contract with the client or callers and hence suitable for

1. Services published for much wider unknown audience
2. Require large input payload
3. Requiring different level for authentication

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   Like         Discuss         Correct / Improve     soap vs rest  soap  rest     Asked in 2 Companies

 Q60. What are the types of applications we can create using Elastic Beanstalk ?Amazon Web Services (AWS)
Ans. Web Server and Worker

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   Like         Discuss         Correct / Improve     elastic beanstalk

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