Top 100+ AWS Interview Questions & Answers for 2023

1. Define and explain the three basic types of cloud services and the AWS products that are built based on them?

Cloud services can be classified into three main categories: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).

Infrastructure as a Service (IaaS): IaaS provides access to computing resources such as virtual machines, storage, and networking. These resources can be used to build and run applications and services. In IaaS, the infrastructure is managed by the cloud provider, and the user is responsible for managing the applications and services that run on top of it. Examples of AWS IaaS products include Amazon Elastic Compute Cloud (EC2), Amazon Simple Storage Service (S3), and Amazon Virtual Private Cloud (VPC).

Platform as a Service (PaaS): PaaS provides a platform for building, deploying, and managing applications and services. It includes tools and services for developing, testing, and deploying applications, as well as infrastructure resources such as servers, storage, and networking. In PaaS, the infrastructure and platform are managed by the cloud provider, and the user is responsible for developing and managing the applications and services that run on top of it. Examples of AWS PaaS products include Amazon Elastic Beanstalk, Amazon AppStream, and AWS CodePipeline.

Software as a Service (SaaS): SaaS provides access to software applications that are delivered over the internet and can be used on any device with an internet connection. In SaaS, the software, infrastructure, and platform are all managed by the cloud provider, and the user is responsible for using the software. Examples of AWS SaaS products include Amazon WorkSpaces, Amazon Chime, and Amazon Connect.

It’s worth noting that these categories are not mutually exclusive, and many cloud services can be classified into multiple categories. For example, Amazon EC2 can be considered both an IaaS and a PaaS service because it provides access to infrastructure resources and also includes tools and services for building and deploying applications.

2. What is the relation between the Availability Zone and Region?

In Amazon Web Services (AWS), a region is a geographical area that consists of multiple availability zones. An availability zone is a physically separate data center within a region, and is designed to be isolated from failures in other availability zones. Each availability zone has its own power, networking, and cooling, and is connected to the other availability zones in the region through low-latency links.

The main purpose of availability zones is to provide high availability and fault tolerance for cloud applications. By distributing resources across multiple availability zones, you can build applications that are resilient to failures in individual data centers. If one availability zone experiences an outage, the other availability zones can continue to operate, ensuring that your applications remain available to users.

You can choose to launch resources in a specific availability zone, or you can use the AWS Management Console or API to specify that resources should be distributed evenly across multiple availability zones. This can help to ensure that your applications are resilient to failures and have the capacity to handle unexpected increases in traffic.

Overall, the relationship between availability zones and regions is that availability zones are a component of regions, and are used to provide high availability and fault tolerance for cloud applications. By using multiple availability zones within a region, you can build applications that are resilient to failures and can continue to operate even if one or more availability zones experiences an outage.

3. What is auto-scaling?

Auto Scaling is a service that enables you to automatically scale your Amazon Elastic Compute Cloud (EC2) or Amazon Elastic Container Service (ECS) resources based on demand. With Auto Scaling, you can set rules for when to scale up or down the number of resources in your application, and the service will automatically adjust the number of resources to meet those rules.

Auto Scaling can help you to optimize the performance and cost of your applications by automatically scaling resources up or down based on demand. For example, you can use Auto Scaling to ensure that your application has enough capacity to handle increased traffic during peak periods, and to scale down resources when traffic is low to save on costs.

Auto Scaling works by creating and managing a group of EC2 instances or ECS containers, called an Auto Scaling group. You can specify the minimum and maximum number of resources that should be in the group, and set rules for when to scale up or down based on metrics such as CPU utilization or network traffic. Auto Scaling will then automatically add or remove resources from the group to ensure that the number of resources meets your defined rules.

Overall, Auto Scaling is a useful service for managing the capacity and performance of your AWS applications, and can help you to optimize the cost of your resources by scaling them up and down based on demand.

4. As part of your marketing work requires you to push messages onto Google, Facebook, Windows, and Apple through APIs or AWS Management Console. Which of the following services do you use?

1.AWS CloudTrail

2.AWS Config

3.Amazon Chime

4.AWS Simple Notification Service

If you need to push messages onto Google, Facebook, Windows, and Apple as part of your marketing work, you would likely use AWS Simple Notification Service (SNS). AWS SNS is a fully managed messaging service that enables you to send messages to various devices or services through APIs or the AWS Management Console. It supports a wide range of messaging protocols and delivery methods, including SMS, email, and push notifications to mobile devices..

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