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AWS Interview Questions and Answers


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24. What Are The Key Components of AWS?

The fundamental elements of AWS are:
  • Route 53: A DNS web service
  • Easy E-mail Service: It permits addressing e-mail utilizing RESTFUL API request or through normal SMTP
  • Identity and Access Management: It gives heightened protection and identity control for your AWS account
  • Simple Storage Device or (S3): It is warehouse equipment and the well-known widely utilized AWS service
  • Elastic Compute Cloud (EC2): It affords on-demand computing sources for hosting purposes. It is extremely valuable in trouble of variable workloads
  • Elastic Block Store (EBS): It presents persistent storage masses that connect to EC2 to enable you to endure data beyond the lifespan of a particular EC2
  • Cloud Watch: To observe AWS sources, It permits managers to inspect and obtain key Additionally, one can produce a notification alert in the state of crisis.

25. Explain Can You Vertically Scale An Amazon Instance ? How?

Surely, you can vertically estimate on Amazon instance. During that
  • -Twist up a fresh massive instance than the one you are currently governing
  • -Delay that instance and separate the source webs mass of server and dispatch
  • -Next, quit your existing instance and separate its source quantity
  • -Note the different machine ID and connect that source mass to your fresh server
  • -Also, begin it repeatedly Study AWS Training Online From Real Time Experts

26. What Are The Components Involved In Amazon Web Services?

There are 4 components involved and are as below.
  • Amazon S3: with this, one can retrieve the key information which are occupied in creating cloud structural design and amount of produced information also can be stored in this component that is the consequence of the key specified.
  • Amazon EC2 instance: helpful to run a large distributed system on the Hadoop cluster. Automatic parallelization and job scheduling can be achieved by this component.
  • Amazon SQS: this component acts as a mediator between different controllers. Also worn for cushioning requirements those are obtained by the manager of Amazon.
  • Amazon SimpleDB: helps in storing the transitional position log and the errands executed by the consumers.

27. What Are The Different Types Of Events Triggered By Amazon Cloud Front?

Different types of events triggered by Amazon CloudFront are as follows:
  • Viewer Request: When an end user or a client program makes an HTTP/HTTPS request to CloudFront, this event is triggered at the Edge Location closer to the end user.
  • Viewer Response: When a CloudFront server is ready to respond to a request, this event is triggered.
  • Origin Request: When CloudFront server does not have the requested object in its cache, the request is forwarded to Origin server. At this time this event is triggered.
  • Origin Response: When CloudFront server at an Edge location receives the response from Origin server, this event is triggered.

28. What Are The Main Features Of Amazon Cloud Front?

Some of the main features of Amazon CloudFront are as follows: Device Detection Protocol Detection Geo Targeting Cache Behavior Cross Origin Resource Sharing Multiple Origin Servers HTTP Cookies Query String Parameters Custom SSL.

29. What Is The Relation Between An Instance And Ami?

AMI can be elaborated as Amazon Machine Image, basically, a template consisting software configuration part. For example an OS, applications, application server. If you start an instance, a duplicate of the AMI in a row as an unspoken attendant in the cloud.

30. Can a primary interface be detached on EC2 instance?

It is possible. You can only attach and detach secondary interfaces on an instance of EC2 but you would not be able to detach eth0 interface.

31. Mention the VPCs for which the classic link cannot be enabled.

A VPC which has a classless inter domain routing is one type of VPCs for which you cannot enable classic link. Another one is the VPC which has a route table entry that points to CIDR space.

32. What are the VPCs, elastic IP addresses, subnets, Internet gateways, virtual private gateways, customer gateways and VPN connections can be created?

There are:-
  1. There are five Amazon VPCs per AWS account per region.
  2. For per Amazon VPC there are two hundred subnets
  3. For per AWS account per region there are five Amazon VPC elastic IP addresses.
  4. 4. For per AWS per region there are five virtual private gateways.
  5. For each VPC there is one Internet gateway.
  6. There are fifty customer gateways for every AWS account per region.
  7. For every virtual private gateway, there are ten IPsec VPN connections

33. Is it possible to have more than two network interfaces to be attached to EC2 instance?

The number of network interfaces that are to be attached with an EC2 instance will depend on the type of the instance.

34. Can a network interface in one VPC be attached to an instance that is present in another VPC?

It is possible for the network interfaces to be attached to instances that are in the same virtual private cloud as that of the interface.

35. Is it possible to peer two VPCs with matching IP address ranges?

No, it is not possible to peer two VPCs with matching IP address ranges since peered VPCs should posses IP ranges that are non-overlapping.

36. What does an AMI include?

An AMI includes the following things:
  1. A template for the root volume for the instance
  2. Launch permissions decide which AWS accounts can avail the AMI to launch instances
  3. A block device mapping that determines the volumes to attach to the instance when it is launched

37. Explain what is T2 instances?

T2 instances are designed to provide moderate baseline performance and the capability to burst to higher performance as required by workload

38. In VPC with private and public subnets, database servers should ideally be launched into which subnet?

With private and public subnets in VPC, database servers should ideally launch into private subnets.

39. While connecting to your instance what are the possible connection issues one might face?

The possible connection errors one might encounter while connecting instances are
  1. Connection timed out
  2. User key not recognized by the server
  3. Host key not found, permission denied
  4. Unprotected private key file
  5. Server refused our key or No supported authentication method available
  6. Error using MindTerm on Safari Browser
  7. Error using Mac OS X RDP Client.

40. Explain how the buffer is used in Amazon web services?

The buffer is used to make the system more robust to manage traffic or load by synchronizing different component. Usually, components receive and process the requests in an unbalanced way, With the help of buffer, the components will be balanced and will work at the same speed to provide faster services.

41. Mention what are the security best practices for Amazon EC2?

For secure Amazon EC2 best practices, follow the following steps:
  1. Use AWS identity and access management to control access to your AWS resources
  2. Restrict access by allowing only trusted hosts or networks to access ports on your instance
  3. Review the rules in your security groups regularly
  4. Only open up permissions that your require
  5. Disable password-based login, for instance, launched from your AMI.

42. Explain the features of Amazon EC2 services.

Amazon EC2 services have following features:
  1. -Virtual Computing Environments
  2. -Proffers Persistent storage volumes
  3. -Firewall validating you to specify the protocol
  4. -Pre-configured templates
  5. -Static IP address for dynamic Cloud Computing.

43. What is the purpose of T2 instances?

T2 instances are designed for
  1. Providing moderate baseline performance
  2. Higher performance as required by workload.

44. What are the various ways to access EC2?

This can be done with Command Line Interface and Web Based Interface. Also, there are tools for Powershell in Windows through which it can simply be done.

45. What is a Serverless App?

It is nothing but an integration of Lambda functions that aims to accomplish some assigned tasks. It supports Node.Js

46. What is the difference between anonymous class and Lambda function?

One important difference is the use of keywords. The keyword “this” in Lambda resolve to enclosing class while the same in case of Anonymous Class resolves to the anonymous class itself.

47. What is elastic blockage storage in Lambda?

It is basically a virtual storage area network from where tasks can be started. It can tolerate faults easily and users need not to worry about the loss of data even in case the disk damages in the RAID. Provisioning and allocating the storage can also be done in Elastic Block Storage. If required, it can also be connected to the API.

48. Is it possible to debug and troubleshoot the micro or small services?

Yes, it’s possible. It can be performed even when the function is running and appropriate tasks are being performed.

49. How can you send request t Amazon S3?

Amazon S3(simple storage service) is a REST service, by sending a request using the REST API or the AWS SDK wrapper libraries that wrap the Amazon S3 REST API.

50. Distinguish between scalability and flexibility?

Scalability: The ability of any scheme to intensify the tasks on its hardware resources to hold the inconsistency in command is called as scalability.
Flexibility: The aptitude of a schema that augments the task on the hardware property is known as flexibility. AWS provides several configuration solutions for the AWS flexibility, scalability, availability and management.

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