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 Q421. Can we move an existing instance to a placement group ?Amazon Web Services (AWS)
Ans. No but we can create an AMI and then launch a new instance in placement group.

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 Q422. Can we merge placement groups ?Amazon Web Services (AWS)
Ans. No

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 Q423. Can we use all EC2 instance types in placement group ?Amazon Web Services (AWS)
Ans. No, only the following type are allowed

Compute Optimized
GPU
Memory Optimized
Storage Optimized

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 Q424. What are different types of EC2 Placement Groups in AWS ? What is the difference between them ?Amazon Web Services (AWS)
Ans. Clustered and Spread

All instances in Clustered group is in same availability zone and whereas instances in spread could be in different az or regions.

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 Q425. Are you using Auto Scaling for your EC2 instances ? How have you configured Auto scaling policy ?Amazon Web Services (AWS)
Ans. yes, you can create auto scaling policy to set max and min no of instance.

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

 Q426. What is the default size of list ? How it is growable ?Core Java
Ans. Default size is 10.
Regard how size will increase.

Inside add() method there is one method called ensureCapacity() which will check list has enough size available.

This ensureCapacity() method if found size of list need to increase then it will call grow() method which will create new list of extra size and copy existing list data to new one and return.

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   Like         Discuss         Correct / Improve     list  default size of list     Asked in 1 Companies

 Q427. Can a method return more than one value at a time in Java ?Core Java
Ans. object / native type returned can only be one but an object can comprise of a array , collection or a group of different value types.

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   Like         Discuss         Correct / Improve     java methods

 Q428. Difference between Base Class, Derived Class , Abstract Class and Concrete Class ?Core Java
Ans. Base Class is a relative term used to signify the Parent class in Parent - Child or Base - derived relationship.

Derived Class is a relative term used to signify the Child class in Parent - Child or Base - derived relationship.

Abstract Class is a class that is not allowed to be instantiated and hence can serve only a base class for it's usage.

Concrete Class is the class which is supposed to be instantiated and hence provide definition for all implementing interface methods and extending abstract methods.

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   Like         Discuss         Correct / Improve     Base Class   Derived Class    Abstract Class   Concrete Class

 Q429. Can an abstract class be a derived class ?Core Java
Ans. Yes, an abstract class can extend another class.

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 Q430. What is the relationship between Base Class and Abstract Class ?Core Java
Ans. Abstract Class is a class that's only allowed to be a Base class for it's usage. It can never be instantiated on it's own.

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   Like         Discuss         Correct / Improve     base class  abstract class      basic

 Q431. What is a base class ? Is Abstract class and Base class the same thing ?Core Java
Ans. Base Class is a relative term. For example - Class Vehicle is a Base class of Class Car. Even though Base class is derived in this case , there is no restriction on instantiation of Vehicle class.

Abstract Class is a class that is meant only to be a Base Class and not allowed to be instantiated.

Abstract Class is a Base Class that isn't allowed to be instantiated and is only meant for carrying definition to derived class and help participate in runtime polymorphism.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q432. What are the biggest challenges for Java technology in the coming years?Core Java
Ans. JVM - With Cloud and Serverless, this could be a hurdle for it to be preferred technology.

Confusion between OOP and Functional Programming.

Slower speed of innovation due to wider adoption.

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 Q433. Somebody changed the permissions on a S3 bucket, Which Aws service can help locate the user who performed the action ?Amazon Web Services (AWS)
Ans. CloudTrail

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   Like         Discuss         Correct / Improve     aws cloudtrail  aws iam  amazon iam

 Q434. Difference between CloudWatch and CloudTrail ?Amazon Web Services (AWS)
Ans. CloudWatch is for monitoring resources whereas CloudTrail is for auditing activity.

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch  aws cloudtrail  aws cloudwatch  amazon cloudwatch vs aws cloudtrail

 Q435. How frequently Cloudwatch monitor AWS services for generating metrics ?Amazon Web Services (AWS)
Ans. 5 mins for Standard / Basic
1 min for Detailed / advanced

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 Q436. What are the Default metrics available for EC2 in CloudWatch ?Amazon Web Services (AWS)
Ans. CPU, Disk, Network, Status

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 Q437. Are CloudWatch metrics available with free tier ?Amazon Web Services (AWS)
Ans. Only Basic not advanced

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 Q438. What is the purpose of EC2 Health check ?Amazon Web Services (AWS)
Ans. We can use this check for variety of things -

1. Monitoring the status / Alarms in case it's down
2. Regulating traffic to healthy instances only through Load Balancer

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

 Q439. Difference between internal and external Load Balancer ?Amazon Web Services (AWS)
Ans. Internal Load balancer is used for services which are for internal consumption only and hence doesn't need to direct Web traffic.

External Load balancers are for regulating web traffic.

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   Like         Discuss         Correct / Improve     aws elb  amazon elb

 Q440. Which of the Load balancer - Application / Network provides advanced features ? What is the use of other Load Balancer than if one provides advanced feature than other ?Amazon Web Services (AWS)
Ans. Application Load Balancer is high level ( Level 7 Networking Layer ) and provides better features and flexibility than Network Load Balancer ( Level 4 Network Layer )

Network Load Balancer is turn provides better performance as it regulates raw traffic.

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 Q441. What are the different types of AWS Load Balancers ?Amazon Web Services (AWS)
Ans. Application , Network and Classic

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   Like         Discuss         Correct / Improve     aws elb  amazon elb

 Q442. How would you securely migrate a database to RDS?Amazon Web Services (AWS)
 This question was recently asked at 'Cognizant (C?TS),Overstock'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     aws rds  aws database  amazon cloud database     Asked in 2 Companies

 Q443. Difference between AMI EBS based and AMI Instance Store based ?Amazon Web Services (AWS)
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     aws ami  amazon ami

 Q444. Can we create AMI with encrypted snapshots ?Amazon Web Services (AWS)
Ans. No they need to be unencrypted before an AMI is created.

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 Q445. What is a Volume Snapshot ?Amazon Web Services (AWS)
Ans. Snapshots are point in time copies of Volume.

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   Like         Discuss         Correct / Improve     aws ebs  aws ebs volume

 Q446. How can we create our own AMI ?Amazon Web Services (AWS)
Ans. Volume -> Snapshot -> AMI

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 Q447. Where are snapshots internally stored by AWS ?Amazon Web Services (AWS)
Ans. In S3

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 Q448. Can we create an AMI using volumes ?Amazon Web Services (AWS)
Ans. Yes , We can create snapshots with Volumes and then AMIs with Snapshots.

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 Q449. Can we move volumes across regions or availability zones ?Amazon Web Services (AWS)
Ans. Yes, We can do that through snapshots and AMI

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 Q450. Can we modify volume while attached EC2 is running ?Amazon Web Services (AWS)
Ans. Yes, except Magnetic standard

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

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