Are you preparing for the AWS interview? If Yes, then this blog is for you! This blog helps you get to know the Top AWS Interview Questions that are possibly asked in any Amazon Web Services interview.
We have designed this blog with the latest 2021 AWS Interview Questions and Answers for freshers and experienced professionals. By going through these interview questions, you will be able to crack the AWS interview easily.
Before we start AWS interview questions, let's have a look at a few crazy facts about the Amazon Web Services:
The above points clearly show that the professionals who are capable of handling AWS applications are having high demand and employment opportunities in the market.
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We have categorized AWS Interview Questions - 2021 (Updated) into 4 levels they are:
AWS stands for Amazon Web Services, which is a cloud computing platform. It is designed in such a way that it provides cloud services in the form of small building blocks, and these blocks help create and deploy various types of applications in the cloud. These sequences of small blocks are integrated to deliver the services in a highly scalable manner.
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The Key Components of AWS are:
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S3 is the abbreviation for a simple storage service. It is used for storing and retrieving data at any time and anywhere on the web. S3 makes web-scale computing easier for developers. The payment mode of S3 is available on a pay-as-you-go basis.
It stands for Amazon Machine Image. The AMI contains essential information required to launch an instance, and it is a copy of AMI running in the cloud. You can download as many examples as possible from multiple AIMs.
|Related Article: What is AWS AMI|
Using a single AMI, you can download as many instances as you can. An instance type is used to define the hardware of the host computer for your situation. Each instance is unique and provides the facilities in computational and storage capabilities. Once you install an instance, it looks similar to a traditional host with which we can interact in the same way we do with a computer.
An AIM consists of the things which are mentioned below:
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The Elastic IP address (EIP) is a static Ipv4 address offered by AWS to manage dynamic cloud computing services. Connect your AWS account with EIP so that if you want a static IPv4 address for your instance, you can be associated with the EIP which enables communication with the internet.
CloudFront is a content delivery network offered by AWS, and it speeds up the distribution of dynamic and static web content such as .css, .js, .html, and image files to the users. It delivers the content with low latency and high transfer speed to the users. AWS provides CDN for less price and it suits the best startups.
Virtual Private Cloud (VPC) allows you to launch AWS resources into the virtual network. It allows users to create and customize network configurations according to users’ business requirements.
VPC peering connection is a networking connection that allows connecting one VPC with the other. It enables the route traffic between two VPCs using IPv6 and Ipv4 addresses. Instances within the VPCs behave like as they are in the same network.
S3 in Amazon is a RESt service, and you can send requests by using the AWS SDK or REST API wrapper libraries.
Network Address Translation (NAT) allows instances to connect in a private subnet with the internet and other AWS services. NAT prevents the internet to have an initial connection with the instances.
Amazon Simple Notification Service (SNS )is a web service provided by AWS. It manages and delivers messages or notifications to users and clients from any cloud platform. In SNS, there are two types of clients: subscribers and publishers. Publishers produce and send a message to the subscriber instance through the communication channels. Subscribers receive notification from the publisher over one of the supported protocols such as Amazon SQS, HTTP, and Lambda, etc. Amazon SNS automatically triggers the service and sends an email with a message that “ your EC2 instance is growing” when you are using Auto Scaling.
Amazon SQS stands for Simple Queue Service, and it manages the message queue service. Using this service, you can move the data or message from one application to another even though it is not in the running or active state. SQS sends messages between multiple services, including S3, DynamoDB, EC2 Instance, and also it uses the Java message queue service to deliver the information. The maximum visibility timeout of a message is 12 hours in the SQS queue.
|Related Article: AWS SQS Tutorial|
There are two types of queues in SQS. They are as follows:
Standard Queues: It is a default queue type. It provides an unlimited number of transactions per second and at least one message delivery option.
FIFO Queues: FIFO queues are designed to ensure that the order of messages is received and sent is strictly preserved as in the exact order that they sent.
Below stated are the available instances:
If you want to have a faster and flexible NoSQL database, then the right thing available is DynamoDB, which is a flexible and efficient database model available in Amazon web services.
Amazon Glacier is one of the most important services provided by AWS. The Glacier is an online web storage service that provides you with low-cost and effective storage with security features for archival and data backup. With Glacier, you can store the information effectively for months, years, or even decades.
Redshift is a big data product used as a data warehouse in the cloud. It is the fast, reliable, and powerful product of a big data warehouse.
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Below listed are the two kinds of AMIs provided by AWS:
Till now, you have seen basic interview questions. Now, we will move to the Intermediate Questions.
Elastic Load Balancer( ELB) is a load balancing service offered by AWS. It distributes incoming resources and controls the application traffic to meet traffic demands.
There are three types of load balancers in EC2. They are as follows:
Application Load Balancer: The application load balancer designed to make routing decisions at the application layer. ALC supports dynamic host port mapping and path-based routings.
Network Load Balancer: Network load balancer is designed to make routing decisions at the transport layer. It handles millions of requests per second. Using the flow hash routing algorithm, NCL selects the target from the target groups after receiving a connection from the load balancer.
Classic Load Balancer: Classic load balancer is designed to make routing decisions either at the application layer or transport layer. It requires a fixed relationship between the container instance port and the load balancer port.
T2 instance is one of the low-cost Amazon instances that provides a baseline level of CPU performance.
Security best practices for Amazon EC2 are as below:
The following are the connection issues faced by the user:
Amazon EC2 uses both public and private keys to encrypt and decrypt the login information. The sender uses a public key to encrypt the data and the receiver uses a private key to decrypt the data. Private and public keys are known as key pairs. The public key enables you to access the instance securely and a private key is used instead of a password.
SimpleDB is one of Amazon's services offered by AWS. It is a distributed database and highly available NoSQL data store that offloads the work of database administrators.
Elastic Beanstalk is the best service offered by AWS for deploying and managing applications. It assists applications developed in Java, .Net, Node.js, PHP, Ruby, and Python. When you deploy the application, Elastic beanstalk builts the selected supported platform versions and AWS services like S3, SNS, EC2, cloud watch, and autoscaling to run your application.
Following are the few benefits of the Elastic Beanstalk:
Amazon web service has a global infrastructure that is divided into availability zones and regions. Each region is divided into a geographic area and it has multiple isolated locations called availability zones.
When the developer launches the instance, the root device volume is used to boot the instance that contains the image. When the developer introduces the Amazon EC2, all AMIs are propped up by an Amazon EC2 instance store.
A Server load balancer (SLB) provides content delivery and networking services using load balancing algorithms. SLB distributes the network traffic equally across a group of servers to ensure high-performance application delivery.
The server load balancer works based on two approaches. They are:
The advantages of server load balancer are as follows:
One thing that must be taken into consideration is that no one should resize the data while it is moving from one point to another. The other thing to consider is there should not be any kind of leakage with the security key from the multiple storerooms in the cloud. Dividing the information into different types and encrypting it into valid methods could help you in securing the data in the cloud.
Below listed are the various layers of cloud computing
SaaS: Software as a Service
PaaS: Platform as a Service
IaaS: Infrastructure as a Service
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We have five different types of layers available, which are:
It is nothing but a reservation of resources for one or three years and utilized whenever you need it. The reservation comes on a subscription basis available for a term of 1 year and three years. The hourly rate goes down as the usage increases. Purchasing reservations isn’t just associated with the reservation of resources, but also, comes with the capacity that is required for a particular zone.
Cloud watching is a monitoring tool in Amazon Web Services with which you can monitor different resources of your organization. You can have a look at various things like health, applications, network, etc.
We have two types of cloud watches: essential monitoring and detailed monitoring. The necessary tracking will come to you free of cost, but when it comes to detailed control, you need to pay for it.
The available metrics for EC2 instances are Disk reads, CPU utilization, network packets out, CPUCreditUsage, Disk writes, network packets, networkOut, and CPUCreditBalance.
The minimum size of the object that you can store in S3 is 0 bytes, and the maximum size of an individual object that you can save is 5TB.
Below mentioned are the storage classes available in S3.
We have three different methods available for encrypting the data in S3. They are as follows.
The pricing for S3 is decided by taking into consideration the below topics.
Below are the Advanced AWS Interview Questions for Experienced Professionals
No, at present, Amazon VPC is not supporting any multicast or broadcast.
For each AWS account, 5 VPC elastic addresses are allowed.
The actual content is cached at the places called edge locations. So whenever a user searches for the content, he will find the same at the edge locations.
Snowball is an option available in AWS to transport. Using snowball, one can transfer the data into AWS and out of it. It helps us in transporting massive amounts of data from one destination to another. It helps in lowering the networking expenditure.
Below listed are the advantages of autoscaling.
When a large amount of IP addresses are divided into small chunks, then these tiny chunks are called Subnets.
Under one VPC, we can have 200 subnets.
AWS Cloudtrail is an AWS service that helps you to enable governance, risk auditing, and compliance of your AWS account. Cloud trail records events when actions are taken by the role, user, or an AWS service. Events include when actions are taken by AWS command-line interface, AWS management console, APIs, and AWS SDKs.
Elasticache is a web service that makes the path easier to deploy and store the data in the cloud easily.
AWS Lambda is a computational service that enables you to run code without maintaining any servers. It automatically executes the code whenever needed. You are required to pay for the time that you have used it for. Lambda enables you to run the code virtually for any kind of application without managing any servers.
It is an important feature available in AWS which helps you in preventing the users from accessing the content from specific regions. CloudFront is useful for distributing the content only to desired locations.
Amazon EMR is a survived cluster stage and it helps you to create data structures before the intimation. Big data technologies such as Apache Hadoop and Spark are the tools that enable you to investigate a large amount of data. You can use the data for making analytical goals by using the apache hive and other relevant open source technologies.
It takes less than 5 minutes to store the instance-backed AMI.
Below listed are the essential features of Amazon cloud search.
Following are few examples of DB engines that are used in AWS RDS:
In AWS the in and out traffic to instances is controlled with virtual firewalls which are known as Security groups. Security groups allow you to control traffic based on various aspects such as protocol, port, and source destination.
Block Storage: it functions at a lower level and manages the data asset of blocks.
File Storage: The file storage operates at a higher level or operational level and manages data in the form of files and folders.
We have three different ways to access AWS, such as:
The EBS is the abbreviation for Elastic Block Stores. These blocks act as a persistent volume that can be attached to the instances. The EBS volumes will store the data even if you stop the instances.
You can use security groups, network access controls (ACLs), and flow logs to control your VPC security.
No, it is not providing region-specific usage on all its services. But most of the services are region-based.
Elastic block storage (EBS) is a storage system that is used to store persistent data. EBS is designed to provide block-level storage volumes and to use EC2 instances for both transactions and throughput-intensive workloads at any scale.
As of September 2019, the AWS Serverless Application repository is available in the AWS GovCloud (US-East) region. With this service, the availability of services is increased to a total of 18 AWS regions across North America, South America, the EU, and the Asia Pacific.
The US standard is the cheapest region; it is also the most established AWS region.
The maximum size of an S3 bucket is 5 terabytes.
Following are the most popular AWS Services:
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Yes, AWS RDS is a free tier. RDS helps the AWS customers to get started with the management database service in the cloud for free.
Difference between EBS and S3
|Highly scalable||Less scalable|
|It is a block storage||It is an object storage|
|EBS is faster than S3||S3 is slower than EBS|
|User can access EBS only via the given EC2 instance||Anyone can access S3; it is a public instance.|
|It supports the File system interface||It supports Web interface|
Yes, Amazon S3 is a global service. It provides object storage through the web interface and it uses the Amazon scalable storage infrastructure to run its global e-commerce network.
AWS provides services to its users at a low cost. Amazon web services are easy to use and the user should not worry about security, servers, and databases. Amazon web services have several benefits which make user rely on them.
We hope that this set of AWS interview questions and answers for freshers and experienced professionals will help you in preparing for your interviews. We tried to cover all the questions.
If you find any related question that is not present here, please share that in the comment section and we will add it at the earliest.
|Name||Usha Sri Mendi|
|Author Bio||Usha Sri Mendi is a Senior Content writer with more than three years’ of experience in writing for Mindmajix on various IT platforms such as Tableau, Linux, and Cloud Computing. She spends her precious time on researching various technologies, and startups. Reach out to her via LinkedIn and Twitter|