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 Q1771. 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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 Q1772. How can we restrict CloudFront Access ?Amazon Web Services (AWS)
Ans. Price Class
Geo Targeting
Signed Urls , Signed Cookies

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 Q1773. 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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 Q1774. 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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 Q1775. 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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 Q1776. 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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 Q1777. 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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 Q1778. 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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 Q1779. 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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 Q1780. Which EC2 instance type should be used if the application is memory intensive ?Amazon Web Services (AWS)
Ans. R4

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 Q1781. Which is the cheapest EC2 instance type ?Amazon Web Services (AWS)
Ans. T

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 Q1782. 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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   Like         Discuss         Correct / Improve     hashcode  collections     Asked in 2 Companies

 Q1783. 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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 Q1784. 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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 Q1785. 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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 Q1786. 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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 Q1787. What is the use case of S3 Cross Region replication ?Amazon Web Services (AWS)
Ans. Disaster Recovery and availability

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 Q1788. 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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 Q1789. 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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 Q1790. 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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 Q1791. Which is the most common EC2 instance Type ? Amazon Web Services (AWS)
Ans. T and M

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 Q1792. Can we change the instance Type while it's running ?Amazon Web Services (AWS)
Ans. No

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 Q1793. Import / Export can import data set from ..Amazon Web Services (AWS)
Ans. S3, EBS and Glacier

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 Q1794. How can EBS Volumes be backed up ?Amazon Web Services (AWS)
Ans. Through Snapshots

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 Q1795. 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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 Q1796. What is the name of DNS service provided by AWS ?Amazon Web Services (AWS)
Ans. Route 53

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   Like         Discuss         Correct / Improve     AWS DNS  aws Route 53     Asked in 4 Companies

 Q1797. Difference between List and ArrayList ?Core Java
Ans. List is an interface whereas ArrayList is an implementation of List.

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   Like         Discuss         Correct / Improve     list  arraylist  list vs arraylist  difference between  collections     Asked in 2 Companies      basic

 Q1798. 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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 Q1799. 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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 Q1800. 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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