Interview Questions and Answers for 'Amazon' | Search Interview Question

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Q61. What happens to backups if we delete the RDS instance ?

Ans. Automated Backups are deleted automatically whereas Snapshots are preserved. Upon terminating RDS instance , AWS gives a warning about that and requests to create a final snapshot before terminating the instance.

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Q62. Describe best practices with respect to AWS security groups ?

Amazon Web Services (AWS)

Ans. Configure it while creating EC2 instance only

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Q63. How would you secure EC2, Volume and Snapshots in Cloud ?

Amazon Web Services (AWS)

Ans. Adding more security group, it works like a firewall

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Q64. What is mounting in AWS ?

Amazon Web Services (AWS)

Ans. Attaching Volumes ( EBS / EFS ) on AWS Computing ( EC2, EKS )

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Q65. Can we have internal or private ELB as origin in cloudfront ?

Amazon Web Services (AWS)

Ans. No, it should be public as cloudfront doesn't have a way to access private ELB.

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Q66. Difference between NAT Instances and NAT Gateway

Amazon Web Services (AWS)

Ans. High bandwidth and availability in NAT Gateway
NAT Gateway is completely managed by AWS
NAT Gateway is auto scalable
NAT Instance is just like EC2 instance and hence backed by security group
NAT Instance can be used as bastion host whereas NAT Gateway cannot be.

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Q67. Why would a cloud customer use resources in multiple regions and zones ?

Cloud Computing

Ans. 1. Fault Tolerance
2. Better Access by bringing the application closer to the users.

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Q68. What are system integrators in Cloud Computing?

Cloud Computing

^{This question is still unanswered. Can you please provide an answer.}

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Q69. Write a program to print the index of the first non repeated character in a java string

Core Java

Ans. public class BuggyBread1{
public static void main (String args[]) {
   String str = "hheello world";
   char[] charArray = str.toCharArray();
   char selectedChar = 'a';
   for(char char1: charArray){
      if(!str.contains(Character.toString(char1).concat(Character.toString(char1)))){
         selectedChar = char1;
         break;
      }
   }
   System.out.println(str.indexOf(Character.toString(selectedChar)));
}
}

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Q70. Difference between TCP and UDP ?

Networking

Ans. http://www.cyberciti.biz/faq/key-differences-between-tcp-and-udp-protocols/

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Q71. How would you count the number of words in a string consisting of uneven number of spaces between words( not dictionary words)? With and without library functions.

Core Java

Ans. package com.string;

import java.util.Scanner;

public class String13 {
public static void main(String[] args) {
System.out.println("Enter Sentence");
Scanner sc=new Scanner(System.in);
String sentence=sc.nextLine();
String[] words=sentence.split(" ");
int count=0;
for (String string : words) {
string.trim();
if(!string.equals("")){
count++;
System.out.println(string " " count);
}
}
}
}

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Frequently asked in high end product companies.

Q72. Write code for LRU Cache

Core Java

Ans. https://www.geeksforgeeks.org/lru-cache-implementation/

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Q73. Given array of integers, find first two numbers that adds up to 10.

Core Java

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Q74. Explain bubble sort.

Algorithm

Ans. array is traversed from first element to last element. Here current element is compared with next element. If current element is greater than next element it is swapped.

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Q75. Write code to check if a Binary tree is symmetrical

Algorithm

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Q76. Write a program to reverse words of a sentence.

Core Java

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Q77. how to get most significant bit from a byte?

Core Java

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Q78. Write a function that returns the depth of a tree.

Algorithm

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Q79. Write code to find the node where two linked lists intersect.

Algorithm

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Q80. How to convert a bst to doubly linked list

Algorithm

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Q81. Given a string with multiple opening and closing brackets, determine if the string is valid or not ( to see if the string has all closing brackets for each opening bracket ) ?

Core Java

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Q82. Given a string and index for the opening bracket, find the index of matching closing bracket.

Core Java

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Q83. What is AWS or Amazon Web Services ?

Amazon Web Services (AWS)

Ans. These are the platforms or set of services provided by Amazon for cloud services , database storage , content delivery and other business applications and solutions.

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Q84. What are the different layers of cloud computing ?

Infrastructure

Ans. Paas - Platform as a service
Iaas - Infrastructure as a service
Saas - Software as a service

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Q85. What is Amazon EC2 ?

Amazon Web Services (AWS)

Ans. Amazon Elastic Compute Cloud or EC2 provides scalable computing capacity in the AWS cloud. It can be used to create Virtual Environments , storage and configure. EC2 enables to upgrade or downgrade infrastructure according to the rules defined ( with fluctuation in latency, traffic etc )

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Q86. What is the difference between Elastic Compute Cloud and Elastic Beanstalk ?

Amazon Web Services (AWS)

Ans. EC2 is Amazon computing service whereas Elastic Beanstalk is the AWS service for deploying and managing web applications.

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Q87. How do you check logs for your application in AWS ?

Amazon Web Services (AWS)

Ans. We can do it by either going to Elastic Beanstalk -> Respective instance -> Logs

or using CloudWatch -> Logs -> Respective Log Group

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Q88. What is AWS CloudWatch ?

Amazon Web Services (AWS)

Ans. Amazon CloudWatch is a monitoring service for AWS cloud resources like Beanstalk and DB instances. We can use CloudWatch to monitor the state of resources, collect metrices, set alarms and appropriate response to the alarm state.

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Q89. What is a shard in Kinesis stream ?

Amazon Web Services (AWS)

Ans. A shard is a uniquely identified group of data records in a stream or we can say that Shard is a partition in Kinesis stream. A shard supports a fixed bandwidth i.e fixed number of messages per second. The total capacity of the stream is the sum of the capacities of its shards. If the data rate changes, we can allocate / deallocate more shards to accommodate that.

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Q90. What is the relationship between shard and partition key in kinesis stream ?

Amazon Web Services (AWS)

Ans. A partition key is used to group data by shard within a stream. A partition key identifies which shard the message belong to.

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