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 Q481. 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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   Like         Discuss         Correct / Improve     aws ebs  aws root volume

 Q482. 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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 Q483. 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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 Q484. 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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 Q485. 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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 Q486. Which is the cheapest EC2 instance type ?Amazon Web Services (AWS)
Ans. T

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 Q487. Which EC2 instance type should be used if the application is memory intensive ?Amazon Web Services (AWS)
Ans. R4

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 Q488. 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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 Q489. 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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 Q490. 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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 Q491. What are the different price options available for EC2 ?Amazon Web Services (AWS)
Ans. On Demand
Reserved
Spot
Dedicated Host

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 Q492. 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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 Q493. 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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 Q494. 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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 Q495. 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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 Q496. 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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 Q497. 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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 Q498. 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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 Q499. write a program for 4 digit otp generation?Design
Ans. import java.util.Random;

public class OTPGenerator {
public static void main(String[] args) {
int otpLength = 4;
String otp = generateOTP(otpLength);
System.out.println("Generated OTP: " otp);
}

private static String generateOTP(int length) {
StringBuilder otp = new StringBuilder();
Random random = new Random();

for (int i = 0; i < length; i ) {
int digit = random.nextInt(10);
otp.append(digit);
}

return otp.toString();
}
}

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 Q500. 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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 Q501. What is AWS Storage Gateway?Amazon Web Services (AWS)
Ans. It's an on premise virtual appliance that can be used as cache to store s3 locally at customer site.

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 Q502. How can we restrict CloudFront Access ?Amazon Web Services (AWS)
Ans. Price Class
Geo Targeting
Signed Urls , Signed Cookies

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 Q503. 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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 Q504. What are the different things we can restrict CloudFront access on ?

Amazon Web Services (AWS)
Ans. 1. Protocol ( http, https )
2. Url Pattern ( *, /abc* )
3. Operation ( Put , Post , Delete etc )
4. Geo

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 Q505. What is origin and distribution wrt to AWS CloudFront ?Amazon Web Services (AWS)
Ans. Origin is the origin of File or services which CloudFront distributes like S3 in US East-1

Distribution is the combination of Edge locations that helps in the distribution of content / service.

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 Q506. What is CDN ? Which AWS service is used for it ?Amazon Web Services (AWS)
Ans. CDN is Content Delivery Network
AWS CloudFront provides CDN service

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 Q507. Does S3 prices vary by region ?Amazon Web Services (AWS)
Ans. Yes

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 Q508. Which AWS service can help S3 with distribution data ?Amazon Web Services (AWS)
Ans. AWS CloudFront

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 Q509. What are the different types of encryption provided by AWS S3 ?Amazon Web Services (AWS)
Ans. In Transit ( SSL / TSL )
At Rest Server Encryption ( SSE-S3, SSE-KMS, SSE-C )

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 Q510. Can we log all S3 accesses ?Amazon Web Services (AWS)
Ans. Yes

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