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

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Q1841. Describe AWS VPC and subnets.

Ans. VPC stands for Virtual Private Cloud. You can define a VPC and subnets for a region in AWS and that can be used to access shared resources on the cloud. For eg: API gateway to access any file on S3.

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Q1842. Can you explain what are NAT instances and what are they used for ?

Amazon Web Services (AWS)

Ans. If instances in private subnet need to access internet without exposing the IP address to outside world , we use Nat gateway or nat instance. So there is a direct outbound traffic but not direct inbound traffic.

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Q1843. What type of consistency does Amazon S3 provides ?

Amazon Web Service (AWS)

Ans. Eventual consistency

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Q1844. How to design a scalable S3 service ?

Amazon Web Services (AWS)

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Q1845. Difference between EC2 and S3 ?

Amazon Web Services (AWS)

Ans. Ec2 is a computing service whereas S3 is a object based storage.

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Q1846. A company is planning to store documents in AWS storage, their requirement is initially when they store any documents they need to be available readily to download and after 15 days documents need not be readily available to download. Which type of storage will you choose?

Amazon Web Services (AWS)

Ans. S3 standard, and then to Glacier.

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Q1847. create an SQL query across multiple tables involving outer joins

Database

Ans. Select * from table1 t1Left outer join table2 t2 on t1.tid = t2.id

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Q1848. What is the limit for Ec2 SSH sessions ?

Amazon Web Services (AWS)

Ans. Max sessions limit is defined in sshd_config. Default is set to 10 but can be overridden.

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Q1849. Difference between Default VPC and Custom VPC.

Amazon Web Services (AWS)

Ans. Default VPC is provided by AWS whereas custom VPC needs to be created.

All subnets in default VPC have internet access whereas it's specified by user in Custom VPC.

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Q1850. Write a Program to print all nodes of the data structure ?

Algorithm

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Q1851. Which programming language you hate the most and Why ?

General

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Q1852. How do you manage environment specific configuration for your lambda functions ?

Amazon Web Services (AWS)

Ans. We are using Yaml for initializing configuration and Environment Variables for overriding them.

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Q1853. Which is a better way to keep environment specific configuration in AWS Lambda - Environment Variables or external service like S3 or RDS ?

Amazon Web Services (AWS)

Ans. Possible Answer - Env variable or use parameter store

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Q1854. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q1855. Can constructors be final ?

Core Java

Ans. No. They are never inherited and therefore are not subject to hiding or overriding.

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Q1856. Can a constructor be declared static ? Why ?

Core Java

Ans. No.

When we declare a method static, it means that "this belongs to class as whole and not particular instance". The whole purpose of constructor is to initialize a object and hence there is no sense having static constructor.

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Q1857. How can we take snapshots and track changes to environment variables in Elastic Beanstalk or Lambda ?

Amazon Web Services (AWS)

Ans. We can use AWS Config

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Q1858. If you are asked to develop a financial system, how would you make sure that there are proper checks , balances and audits ?

Solution

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Q1859. How can you prove your honesty ?

General

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Q1860. Which maven commands you usually work with ?

Maven

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Q1861. why is "".equals(str); safer than str.equals("")?

Core Java

Ans. str.equals("") this statement will throw NullPointerException if str is null where as "".equals(str) works fine even if str is null

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Q1862. What is the minimum number of tables required to perform a SQL join?

Database

Ans. 1 , We can do self join

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Q1863. How would you test a Twitter application ?

Testing

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Q1864. Can we keep application configuration at different places and what could be the consideration for choosing multiple places for doing so ?

Design

Ans. Yes an application can have configuration stored at multiple places. Factors that could facilitate such a design could be

1. Type of config information - We may have a case to store confidential information differently than other regular config value

2. Environment - We may like to have a base config ( defined in application package ) and then a different override mechanism in different environments.

3. Centralization - Sometime some configs need to be shared across application and hence centralized.

4. Testing - Testing against config may not be possible in some enviornments in certain cases and hence additional config store might be kept for testing purpose only.

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Q1865. Do you think it's a good practice to keep passwords in config files ?

Solution

Ans. We can keep them in config as encrypted values.

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Q1866. How to write an iterator for an iterator of iterators?

Core Java

Ans. CustomArrayList myarrayList = new CustomArrayList();
      myarrayList.add("Value 1");
      myarrayList.add("Value 2");
      myarrayList.add("Value 3");

      for (String string : myarrayList) {
         System.out.println(string);
      }

package sample.utils;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CustomArrayList implements Iterable {

   private ArrayList mylist = new ArrayList();

   public void add(T t) {
      this.mylist.add(t);
   }

   @Override
   public Iterator iterator() {
      return new CustomIterator(mylist);
   }

   class CustomIterator implements Iterator {

      private int indexPosition = 0;
      private List internalList;

      public CustomIterator(List internalList) {
         this.internalList = internalList;
      }

      @Override
      public boolean hasNext() {
         if (internalList.size() >= indexPosition 1) {
            return true;
         }
         return false;
      }

      @Override
      public E next() {
         E val = internalList.get(indexPosition);
         indexPosition ;
         return val;
      }

   }

}

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Q1867. What are the disadvantages of binary search trees?

Algorithm

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Q1868. Please explain the architecture of our application through a diagram ?

General

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Q1869. How many heaps will be there with 3 threads ?

Core Java

Ans. All threads share a common heap.

Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, you will get a stack overflow.

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Q1870. What does 'variable hoisting' mean?

JavaScript

Ans.

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