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 Q2251. Which is the most common EC2 instance Type ? Amazon Web Services (AWS)
Ans. T and M

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 Q2252. Can we change the instance Type while it's running ?Amazon Web Services (AWS)
Ans. No

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 Q2253. Import / Export can import data set from ..Amazon Web Services (AWS)
Ans. S3, EBS and Glacier

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 Q2254. Which AWS services provide automated backups ?Amazon Web Services (AWS)
Ans. RDS, RedShift and Elastic Cache

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 Q2255. How can EBS Volumes be backed up ?Amazon Web Services (AWS)
Ans. Through Snapshots

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 Q2256. Use Case for S3 RRS ?Amazon Web Services (AWS)
Ans. If Back up is not needed and can be restored from another storage.

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 Q2257. What is the name of DNS service provided by AWS ?Amazon Web Services (AWS)
Ans. Route 53

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 Q2258. Difference between List and ArrayList ?Core Java
Ans. List is an interface whereas ArrayList is an implementation of List.

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 Q2259. Does attached EBS volume get deleted if we terminate EC2 instance ?Amazon Web Services (AWS)
Ans. By default, Root volume gets terminated whereas additional volume doesn't.

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 Q2260. Difference between EC2 instance public and private key ?Amazon Web Services (AWS)
Ans. public key is used for locking whereas private key is used for unlocking. public key can be used for locking multiple instances and hence can be shared.

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 Q2261. Can we protect EC2 instances from terminating accidentally ?Amazon Web Services (AWS)
Ans. Yes

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 Q2262. What is the difference between EC2 System status check and Instance status check ?Amazon Web Services (AWS)
Ans. System status check is to check if the power or network is working whereas Instance status check goes further and make sure that traffic is going through.

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 Q2263. Which AWS service can be used to monitor EC2 ?Amazon Web Services (AWS)
Ans. CloudWatch

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 Q2264. Can we have EC2 and EBS in different availability zones or regions ?Amazon Web Services (AWS)
Ans. No, they need to be local

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 Q2265. Can we modify volume while attached EC2 is running ?Amazon Web Services (AWS)
Ans. Yes, except Magnetic standard

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 Q2266. Where are snapshots internally stored by AWS ?Amazon Web Services (AWS)
Ans. In S3

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 Q2267. Explain difference between web-based application and Core Java Application ?Java
 This question was recently asked at 'Tripod'.This question is still unanswered. Can you please provide an answer.


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 Q2268. 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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 Q2269. Are CloudWatch metrics available with free tier ?Amazon Web Services (AWS)
Ans. Only Basic not advanced

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 Q2270. What are the Default metrics available for EC2 in CloudWatch ?Amazon Web Services (AWS)
Ans. CPU, Disk, Network, Status

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 Q2271. 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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 Q2272. 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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 Q2273. 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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 Q2274. 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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 Q2275. Can an abstract class be a derived class ?Core Java
Ans. Yes, an abstract class can extend another class.

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 Q2276. 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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 Q2277. 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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 Q2278. Git Commit with commentsGit
Ans. git commit -m '<Comment>'

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 Q2279. 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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 Q2280. 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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