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Q2341. Which is the cheapest EC2 instance type ?

Amazon Web Services (AWS)

Ans. T

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Q2342. If you override hashcode to always return true, how a hash based collection will behave?

Core Java

Ans. At that bucket, it will form a linked list depending on what equals method evaluates for that object.

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Q2343. Can we have EBS Volumes in S3 ?

Amazon Web Services (AWS)

Ans. No , S3 is an object storage and not a Block Storage. But EBS Volume snapshots are internally stored in S3.

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Q2344. What are the different EC2 instance types ?

Amazon Web Services (AWS)

Ans. F,I,G,H,T,D,R,M,C,P,X

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Q2345. Which EBS Volume type cannot be used as a root volume ?

Amazon Web Services (AWS)

Ans. Throughput Optimal HDD and Cold HDD

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Q2346. What is the use case of AWS CloudFront ?

Amazon Web Services (AWS)

Ans. Faster availability and uploading of files and content.

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Q2347. What is the use case of S3 Cross Region replication ?

Amazon Web Services (AWS)

Ans. Disaster Recovery and availability

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Q2348. What is the need of S3 Transitioning ?

Amazon Web Services (AWS)

Ans. Saving Cost by either expiring objects or moving to low cost storage.

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Q2349. What is the use case for AWS Snowball ?

Amazon Web Services (AWS)

Ans. Faster upload of Content through Physical device instead of low speed internet connection.

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Q2350. What is the use case for Geo Targeting / Price Class within AWS CloudFront ?

Amazon Web Services (AWS)

Ans. Saving cost by optimizing content retrieval or upload in certain Geographies.

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Q2351. Which is the most common EC2 instance Type ?

Amazon Web Services (AWS)

Ans. T and M

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Q2352. Can we change the instance Type while it's running ?

Amazon Web Services (AWS)

Ans. No

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Q2353. Import / Export can import data set from ..

Amazon Web Services (AWS)

Ans. S3, EBS and Glacier

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Q2354. Which AWS services provide automated backups ?

Amazon Web Services (AWS)

Ans. RDS, RedShift and Elastic Cache

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Q2355. How can EBS Volumes be backed up ?

Amazon Web Services (AWS)

Ans. Through Snapshots

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Q2356. Which is the default AWS Region ?

Amazon Web Services (AWS)

Ans. US-EAST-1

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Q2357. 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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Q2358. What is the name of DNS service provided by AWS ?

Amazon Web Services (AWS)

Ans. Route 53

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Q2359. Difference between List and ArrayList ?

Core Java

Ans. List is an interface whereas ArrayList is an implementation of List.

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Q2360. 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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Q2361. What is a volume in AWS ?

Amazon Web Services (AWS)

Ans. It's a virtual hard disk that is attached to computing.

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Q2362. 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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Q2363. Can we protect EC2 instances from terminating accidentally ?

Amazon Web Services (AWS)

Ans. Yes

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Q2364. 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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Q2365. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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Q2366. Can EBS Volume be encrypted ?

Amazon Web Services (AWS)

Ans. Yes but not the root volume of default AMIs.

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Q2367. Difference between AWS Root and Additional Volume ?

Amazon Web Services (AWS)

Ans. Root Volume is the primary volume used for installing operating system whereas Additional volume is just additional disk space.

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Q2368. Can we use magnetic storage as Root Volume ?

Amazon Web Services (AWS)

Ans. Yes , but only Magnetic standard.

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Q2369. 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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Q2370. Can we modify volume while attached EC2 is running ?

Amazon Web Services (AWS)

Ans. Yes, except Magnetic standard

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