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Q511. Which AWS services provide automated backups ?

Amazon Web Services (AWS)

Ans. RDS, RedShift and Elastic Cache

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Q512. What is the use case for AWS Gateway cached , stored and VTL ?

Amazon Web Services (AWS)

Ans. AWS Cached - Low Availability than AWS Stored, Lower cost than AWS Stored

AWS Stored - High Availability, High Local Storage Cost

AWS VTL - S3 Used as Back up only.

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Q513. Import / Export can import data set from ..

Amazon Web Services (AWS)

Ans. S3, EBS and Glacier

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Q514. Can we change the instance Type while it's running ?

Amazon Web Services (AWS)

Ans. No

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Q515. Which is the most common EC2 instance Type ?

Amazon Web Services (AWS)

Ans. T and M

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Q516. What are the factors on which price classes are based on in case of EC2, S3, CloudFront and EBS ?

Amazon Web Services (AWS)

Ans. EC2 - Time and Reservation , Instance Type ( Memory , Computation power )
S3 - Accessibility Frequency , Data Transfer , Storage Space
CloudFront - Geography, No of Locations
EBS - IOPS, Access Frequency

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Q517. 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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Q518. 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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Q519. 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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Q520. What is the use case of S3 Cross Region replication ?

Amazon Web Services (AWS)

Ans. Disaster Recovery and availability

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Q521. 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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Q522. 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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Q523. What are the drawbacks of using Spot EC2 instances ?

Amazon Web Services (AWS)

Ans. You cannot reserve the time slot and they can be made to use whenever they are available.

AWS can Terminate the EC2 instance on their own even if it's in use.

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Q524. 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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Q525. 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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Q526. 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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Q527. Which is the cheapest EC2 instance type ?

Amazon Web Services (AWS)

Ans. T

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Q528. Which EC2 instance type should be used if the application is memory intensive ?

Amazon Web Services (AWS)

Ans. R4

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Q529. Which EBS Volume is suitable if we need to install SQL with every high requests per second ?

Amazon Web Services (AWS)

Ans. We can use "Provisioned IOPS SSD"

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Q530. 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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Q531. 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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Q532. What are the different price options available for EC2 ?

Amazon Web Services (AWS)

Ans. On Demand
Reserved
Spot
Dedicated Host

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Q533. What is the use case for "Dedicated Host" EC2 plan ?

Amazon Web Services (AWS)

Ans. If there are regulatory requirements, or proprietary license to be used.

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Q534. 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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Q535. What is the use case for "Reserved" EC2 plan ?

Amazon Web Services (AWS)

Ans. If the usage is continuous , stable and predictable.

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Q536. 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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Q537. What is the use case for Amazon Glacier ?

Amazon Web Services (AWS)

Ans. Amazon Glacier is used for storing archieved files / objects and hence well suited for files where retrieval time isn't that important.

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Q538. What is the use case of aws S3-IA ?

Amazon Web Services (AWS)

Ans. IA stands for infrequently accessed and hence it's suited for files / objects are expected to be accessed infrequently.

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Q539. Write a Program to find depth of node binary tree ?

Algorithm

Ans. public static int getLevel(Node root, int key) {
int levelOfNode = getLevelUtil(root, key, 1);
return levelOfNode;
}

public static int getLevelUtil(Node root, int key, int level) {
if (root == null) return 0;
if (root.data == key) return level;
int left = getLevelUtil(root.left, key, level 1);
int right = getLevelUtil(root.right, key, level 1);
if (left != 0) return left;
else return right;
}

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Q540. What could be done if we try to upload a file larger than the allowed size in S3 ?

Amazon Web Services (AWS)

Ans. We can use multi part upload API

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