AWS Interview Questions

AWS stands for Amazon Web Services. AWS is a platform that provides on-demand resources for hosting web services, storage, networking, databases and other resources over the internet with a pay-as-you-go pricing.

 Key-pairs are secure login information for your instances/virtual machines. To connect to the instances we use key-pairs that contain a public-key and private-key.

There are two types of volumes:

• Instance store volumes
• EBS – Elastic Block Stores

Auto scaling allows you to automatically scale-up and scale-down the number of instances depending on the CPU utilization or memory utilization. There are 2 components in Auto scaling, they are Auto-scaling groups and Launch Configuration.

AMI stands for Amazon Machine Image. AMI is a template that contains the software configurations, launch permission and a block device mapping that specifies the volume to attach to the instance when it is launched.

Reserved instances are the instance that you can reserve a fixed capacity of EC2 instances. In reserved instances you will have to get into a contract of 1 year or 3 years.

• EC2 : Elastic Compute Cloud
• S3 : Simple Storage Service Route53
• EBS:  Elastic Block Store, Cloudwatch,
• Key: Paris are few of the components of AWS.

 S3 stands for Simple Storage Service. It is a storage service that provides an interface that you can use to store any amount of data, at any time, from anywhere in the world. With S3 you pay only for what you use and the payment model is pay-as-you-go.

The different pricing model for EC2 instances are as below:

• On-demand
• Reserved
• Spot
• Scheduled
• Dedicated

EIP stands for Elastic IP address. It is designed for dynamic cloud computing. When you want to have a static IP address for your instances when you stop and restart your instances, you will be using an EIP address.

There are 2 types in cloud watch. Basic monitoring and detailed monitoring. Basic monitoring is free and detailed monitoring is chargeable.

The minimum size of individual objects that you can store in S3 is 0 bytes and the maximum bytes that you can store for individual objects is 5TB.

The default storage class in S3 in Standard frequently accessed.

There are two ways that you can control the access to your S3 buckets:

• ACL: Access Control List
• Bucket policies

Glacier is the backup or archival tool that you use to back up your data in S3.

Diskreads, Diskwrites, CPU utilization, networkpacketsIn, networkpacketsOut, networkIn, networkOut, CPUCreditUsage, CPUCreditBalance.

Cloudwatch is a monitoring tool that you can use to monitor your various AWS resources. Like health check, network, Application, etc.

You need to enable versioning on both source bucket and destination to work with cross region replication. Also both the source and destination bucket should be in different regions.

Roles are used to provide permissions to entities that you trust within your AWS account. Roles are users in another account. Roles are similar to users but with roles you do not need to create any username and password to work with the resources.

Cloudfront is an AWS web service that provides businesses and application developers an easy and efficient way to distribute their content with low latency and high data transfer speeds. Cloudfront is the content delivery network of AWS.

 You can store a maximum individual archive of upto 40 TB.

VPC peering connection allows you to connect 1 VPC with another VPC. Instances in these VPC behave as if they are in the same network.

You can use security groups and NACL (Network Access Control List) to control the security to your VPC.

NAT stands for Network Address Translation. NAT gateways enable instances in a private subnet to connect to the internet but prevent the internet from initiating a connection with those instances.

Following are the types of storage gateway:

• File gateway
• Volume gateway
• Tape gateway

 Snowball is a data transport solution that uses source appliances to transfer large amounts of data into and out of AWS. Using snowball, you can move huge amounts of data from one place to another which reduces your network costs, long transfer times and also provides better security.

Amazon red shift is a data warehouse product. It is a fast and powerful, fully managed, petabyte scale data warehouse service in the cloud.

SNS stands for Simple Notification Service. SNS is a web service that makes it easy to make notifications from the cloud. You can set up SNS to receive email notification or message notification.

The maximum size of messages in SQS is 256 KB.

There are 2 types of queues in SQS:

• Standard queue
• FIFO (First In First Out)

There are 2 types of backups in the RDS database:

• Automated backups
• Manual backups which are known as snapshots.

ELB stands for Elastic Load balancing. ELB automatically distributes the incoming application traffic or network traffic across multiple targets like EC2, containers, IP addresses.

 Following are the benefits of auto scaling:

• Better fault tolerance
• Better availability
• Better cost management

Shared AMI’s are the AMI that are created by other developed and made available for other developed to use.

Dynamic port mapping, multiple port multiple listeners is used in Application Load Balancer, One port one listener is achieved via Classic Load Balancer

A large section of IP Address divided in to chunks are known as subnets

No it’s not possible, we can increase it but not reduce them

If versioning is enabled we can easily restore them

Yes it’s possible from console use modify volumes in section give the size u need then for windows go to disk management for Linux mount it to achieve the modification.

Since RDS is a managed service AWS offers a wide set of parameter in RDS as parameter group which is modified as per requirement

 5 elastic ip per region

Binds the user session with a specific instance.

Elastic Network Interface.

IAAS-Storage

Instance Store backed, EBS Backed

If you have to be batch-oriented, it is workloads.

The storing metadata for the Amazon S3 objects & The Running of relational joins and complex updates.

The re-routes traffic from the instances which are to be updated (or) failed and health to check.

They are used to the put an additional taken wait time to the scale in or scale out events.

Lambda app not used on deploy.