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Q481. Design an in memory object oriented system for a Car manufacturing Company ?

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Q482. Which maven commands you usually work with ?

Maven

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Q483. How can you prove your honesty ?

General

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Q484. 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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Q485. 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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Q486. What is AWS Config service ?

Amazon Web Services (AWS)

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Q487. 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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Q488. 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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Q489. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q490. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q491. 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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Q492. 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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Q493. Which programming language you hate the most and Why ?

General

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Q494. Difference between composite , primary and unique key ?

Database

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Q495. Write a Program to print all nodes of the data structure ?

Algorithm

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Q496. Have you ever worked on continuations in Java ?

Core Java

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Q497. Can we have NAT instance in private subnet ?

Amazon Web Services (AWS)

Ans. No

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Q498. 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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Q499. Do we need to disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. It needs to be done for NAT Instances , not NAT gateway.

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Q500. Why should we disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. Source / destination check means that the instance should wither be a source or end destination as a security check. The purpose of NAT Instance is to provide a gateway for internet access and hence this needs to be unchecked.

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Q501. How can we allow communication between subnets ?

Amazon Web Services (AWS)

Ans. Through security groups

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Q502. Do we have transitive pairing in case of VPC pairing ?

Amazon Web Services (AWS)

Ans. No

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Q503. What is VPC Pairing ? Can we pair VPC across different account ?

Amazon Web Services (AWS)

Ans. VPC pairing is a mechanism through which two VPC ( in same or different account ) can talk to each other.

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Q504. 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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Q505. Can we have more than 1 internet gateway for a VPC in AWS ?

Amazon Web Services (AWS)

Ans. No

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Q506. How can we specify / restrict communication between subnets ?

Amazon Web Services (AWS)

Ans. route tables

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Q507. Difference between Internet Gateway and Virtual private Gateway ?

Amazon Web Services (AWS)

Ans. Internet gateway is a public gateway i.e allows direct http access whereas Virtual private gateway doesn't allow direct http access ( through VPN )

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Q508. 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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Q509. What is mounting in AWS ?

Amazon Web Services (AWS)

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

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Q510. 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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