AWS Interview Questions & Answers | Part 4

AWS Interview Questions & Answers

Q1. How to stop, start and terminate an Amazon EC2 instance?

When an EC2 instance is stopped, the instance set out to accomplish a normal ceasing and then passages to a stopped state. When all the Amazon EBS volumes remain engaged, and we can start the instance once again later. It is not chargeable for additional instance hours while the instance is in a pause.

When an instance is terminated, the instance goes through a normal shutdown, then the fastened Amazon EBS volumes are deleted if not the volume’s DeleteOnTermination attribute is set to false mode. The instance itself is also deleted, and we can’t start the instance again later.

Q2. What are the paramount roles of an AWS solution architect?

  • On the AWS platform, a solution architect designs and depict the AWS architecture and export them to the substantive cloud architecture.
  • A solution architect contrives reliable applications on AWS that are highly fault-tolerant, and he plots dynamically scalable applications.
  • Based on the requirements of the customers, solution architects consolidates structurally complex and multi-tier applications on AWS.
  • They are the key players in devising strategies for the cost control and designs cost-effective programs on the cloud.

Q3. What is the architecture called when someone owns private servers and also have assigned some amount of the work on the public cloud as well?

This sort of cloud architecture is categorized as a hybrid cloud since it employs both public and private clouds. To benefit from this facility and to launch a hybrid cloud system, we need to bring forth the servers of public cloud into a virtual private cloud. Eventually, with the backing of VPN, this combined virtual cloud is connected with the local servers.

Q4. Which instance type is used in case of deploying 4 node clusters of Hadoop in AWS?

The Hadoop cluster consists of two machine systems that regulate the data processing and the data storage of the cluster. While the master machine operates the data, the slave machine stores it. So the configuration hinges on the basis of the workload. So in this prototype of deploying 4 node clusters of Hadoop, c4.8xlarge is recommended for the master machine inasmuch as i2.large instance can be selected for a slave machine. In case if we don’t want to bother configuring the instance ourselves and install the Hadoop cluster manually, Amazon Elastic Map Reduce (EMR) is at our disposal, which takes care of the automatic configuration of the servers. When we plunge the data to be processed into S3, it is processed with EMR, and the processed outcome would be delivered back into the S3.

Q5. Is it possible to use S3 with EC2 instances?

When an instance is supported and patronized by local instance storage, Amazon Simple Storage Service S3 could be used alongside with EC2 virtual computers. With Amazon S3’s highly potent storage systems, it is viable to have access to the efficiently scalable and reliably inexpensive data storage facility. In order to carry out systems proceedings, Amazon Machine Images (AMI) could be loaded into the storage S3 and is moved back and forth between it and EC2.

Q6. How can the data transfer be hastened in Amazon Snowball?

When the mastery of the workstation infrastructure had been effectively constructed, numerous copy operations can be achieved from various terminus points. This procedure could expedite the data transference swiftly.

By creating a set of small files, the heavy workloads of encrypting the larger files could be eliminated.

And by removing needless hops, and thus setting up Snowball as an only active machine, we can accelerate the process of data transfer in minutes.

Q7. How to design a fail-proof and cost-effective application that recovers from Amazon EC2 instance failures?

The best possible way to accomplish this is to have spot instances because the addressed work is not uninterrupted, an already reserved and On-demand instances would be in idle mode. And as the name goes, an on-demand instance is costly. So if you opt-in for an inexpensive application that recovers from the unforeseen EC2 virtual machine failure, spot instances are a wise choice.

Refer AWS Interview QA by Following links:

AWS Interview Questions & Answers | Part 1

AWS Interview Questions & Answers | Part 3

AWS Interview Questions & Answers | Part 2

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September 24, 2019
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