Aspiring to work at Amazon Web Services, but unsure of how to prepare? Don’t worry, we’ve got you covered! Here are all the AWS interview questions and answers you’ll need to pass your interview and land that job you’ve always wanted. After reading this, you’ll be able to answer any question that gets thrown your way.
What is AWS?
Amazon Web Services (AWS) provides a robust set of cloud-based products and services that together comprise an easy-to-use, scalable, and cost-effective solution for startups and companies looking to optimize their computing power in an effective manner. Given that Amazon owns one of the most popular ecommerce sites in history, it should come as no surprise that its cloud services would be equally excellent. AWS’s origins trace back to 2002 when Jeff Bezos told his team he wanted them to launch something huge by using web services like EC2, S3, SQS, SimpleDB and CloudFront. Since then AWS has seen exponential growth; they now host more than 1 million active customers around the world who use AWS technologies as part of their businesses every day.
What do you understand about cloud computing?
Cloud computing is a type of internet-based computing that provides shared resources, software and information to computers and other devices on demand. Cloud computing relies on sharing of resources to achieve coherence and economies of scale, similar to a public utility. However, it is more scalable than traditional hardware-based cloud solutions. Cloud providers typically lease logical resources by means such as physical processors, storage space, network bandwidth and active user accounts. Examples of cloud services include Amazon Web Services (AWS), Microsoft Azure and Google Compute Engine (GCE). Amazon was one of the first companies in 2006 that began offering on-demand computing via web services but not AWS. Microsoft quickly followed with Windows Azure in 2010 and Google launched GCE shortly after in 2011.
What are the different services provided by AWS?
AWS provides a wide variety of services, including but not limited to: Amazon EC2, Amazon RDS, AWS CloudFormation, Amazon S3, Amazon SNS and many more. All these services can be accessed via an AWS Management Console. This console allows you to sign in with your IAM credentials and select which service you wish to use.
How does S3 store data?
S3 stores data in buckets, which can contain objects. An object contains metadata, or data about data, plus an optional set of file contents in a format of your choosing. S3 uses industry-standard servers for storing objects, and therefore scales very well. When you store an object in S3 it is stored redundantly across multiple servers and hard disks to ensure high availability and durability; objects are also error-checked before being stored, to further ensure that data is available when needed. But perhaps most importantly, when you access an object from S3 there’s no need to copy or transfer it; you simply get a reference to its location via a unique key or name.
Define virtual server
A virtual server is a combination of hardware and software that operates as if it were an individual physical server. AWS provides virtual servers in two different types: instance and elastic-ip instances. An instance is more commonly referred to as a virtual machine (VM). Each VM has a predefined amount of RAM, hard disk space, CPU power, etc., just like a physical server would have. An elastic-ip instance allows you to get your own public or private IP address; then you can access your instances from anywhere on the Internet. You may want to consider using elastic-ips if you are performing any sort of Internet-facing activity or need dynamic IP addressing.
Describe load balancing
You can use load balancing to distribute incoming application traffic across multiple Amazon EC2 instances. Load balancing distributes incoming traffic across multiple identical web servers (also known as an instance group). Once a user request is received, an Amazon ELB load balancer directs all subsequent requests for that user session to one of these identical web servers. Because Amazon ELB load balancers route requests based on a user’s IP address and cookies, there is no additional configuration required in your application or on your users’ devices. Because each instance has access to all user data for any sessions being handled by it, it’s critical that only identical instances be included in an instance group.