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 Q2821. Do we need to specify IAM policies in all different regions ?Amazon Web Services (AWS)
Ans. No, They are all global.

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 Q2822. Difference between S3 bucket and Folder ?Amazon Web Services (AWS)
Ans. Bucket is the highest level folder whose name should be unique globally.

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 Q2823. What is the maximum size of a file in S3 ?Amazon Web Services (AWS)
Ans. 5 TB

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 Q2824. Difference between Object based and Block based storage ?Infrastructure
 This question is still unanswered. Can you please provide an answer.


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 Q2825. Can we host a website in S3 ?Amazon Web Services (AWS)
Ans. Yes a static website can be hosted in S3.

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 Q2826. What are the different ways to secure objects in S3 ?Amazon Web Services (AWS)
Ans. Encryption - In Transit , Client Side , Server Side
Restrictive Access - ACL , Bucket Policy

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 Q2827. What status code is returned upon successful upload in S3 ?Amazon Web Services (AWS)
Ans. 200

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 Q2828. What is the default visibility of buckets and objects when they are uploaded in S3 ?Amazon Web Services (AWS)
Ans. private

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 Q2829. Can we make objects public in a bucket which is not public ?Amazon Web Services (AWS)
Ans. No

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 Q2830. What is the difference between client side and server side encryption wrt to S3 objects ?Amazon Web Services (AWS)
Ans. Client side encryption is done by the users on their machines whereas server side encryption is done by AWS when objects are uploaded in S3.

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 Q2831. If we have enabled versioning for S3 bucket, Do we need to make all new versions public whenever new versions are uploaded ?Amazon Web Services (AWS)
Ans. Yes, all new versions are private by default even if the original file has been made public.

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 Q2832. What is a delete marker wrt to S3 objects ?Amazon Web Services (AWS)
Ans. If the objects / bucket is versioned in S3, Any delete operation on S3 object doesn't physically deletes the object but rather creates a delete marker version. We need to delete the delete marker to physically delete it.

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 Q2833. Can we do Cross Region replication in S3 without versioning ?Amazon Web Services (AWS)
Ans. No , Both the source and destination should have versioning enabled.

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 Q2834. Does deletion of an object gets replicated too if we have cross region replication enabled on a bucket ?Amazon Web Services (AWS)
Ans. No, delete markers are not replicated.

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 Q2835. Can we do replication within the same region i.e into a new bucket within same region ?Amazon Web Services (AWS)
Ans. No. Replication is only allowed across regions. We can manually copy into other bucket though.

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 Q2836. Can we do replication to multiple regions and buckets simultaneously ?Amazon Web Services (AWS)
Ans. No, its not allowed currently.

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 Q2837. How can we archieve S3 objects after certain interval ?Amazon Web Services (AWS)
Ans. We can use S3 lifecycle management to transition older objects into AWS Glacier.

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 Q2838. Can we do Lifecycle management in S3 without versioning enabled ?Amazon Web Services (AWS)
Ans. Yes

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 Q2839. Can we log all S3 accesses ?Amazon Web Services (AWS)
Ans. Yes

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 Q2840. 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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 Q2841. Which AWS service can help S3 with distribution data ?Amazon Web Services (AWS)
Ans. AWS CloudFront

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 Q2842. Does S3 prices vary by region ?Amazon Web Services (AWS)
Ans. Yes

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 Q2843. 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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 Q2844. 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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 Q2845. 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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 Q2846. How can we restrict CloudFront Access ?Amazon Web Services (AWS)
Ans. Price Class
Geo Targeting
Signed Urls , Signed Cookies

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 Q2847. 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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 Q2848. 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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 Q2849. 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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 Q2850. 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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