{"id":47387,"date":"2017-12-29T10:09:25","date_gmt":"2017-12-29T04:39:25","guid":{"rendered":"http:\/\/blog.odango.com\/?p=47387"},"modified":"2023-02-03T18:00:44","modified_gmt":"2023-02-03T12:30:44","slug":"amazon-web-services-interview-questions-and-answers-interview-tips","status":"publish","type":"post","link":"https:\/\/asha24.net\/blog\/amazon-web-services-interview-questions-and-answers-interview-tips\/","title":{"rendered":"Amazon Web Services Interview Questions and Answers – Interview Tips"},"content":{"rendered":"\n[et_pb_section bb_built=”1″ next_background_color=”#000000″][et_pb_row][et_pb_column type=”4_4″][et_pb_post_title _builder_version=”3.0.105″ title=”on” meta=”off” author=”on” date=”on” categories=”on” comments=”on” featured_image=”off” featured_placement=”below” text_color=”dark” text_background=”off” title_font=”Source Sans Pro||||||||” title_font_size=”47″ title_font_size_tablet=”40″ title_font_size_phone=”35″ title_font_size_last_edited=”on|desktop” title_text_color=”rgba(0,0,0,0.8)” title_text_align=”left” text_shadow_horizontal_length=”0.08em” text_shadow_vertical_length=”0.08em” text_shadow_blur_strength=”0.08em” title_text_shadow_horizontal_length=”0.08em” title_text_shadow_vertical_length=”0.08em” text_orientation=”center” custom_margin=”|||10%” \/][\/et_pb_column][\/et_pb_row][et_pb_row][et_pb_column type=”4_4″][et_pb_text _builder_version=”3.0.106″ background_layout=”light” text_font=”Titillium Web|300|||||||” text_font_size=”20″ text_font_size_last_edited=”on|desktop” text_text_color=”rgba(0,0,0,0.8)” text_line_height=”1.6em” max_width=”800px” custom_margin=”|||10%”]\r\n\r\n1)\u00a0What is AWS?<\/strong>\r\n\r\nAns:\u00a0<\/strong>AWS (Amazon Web Services<\/a>) is a platform which provides secure cloud services, database storage, offerings to compute power, content delivery among other services to help business level and develop.\r\n\r\n
\r\n\r\n2) What is auto-scaling?\u00a0 How does it work?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Auto scaling is a feature of AWS<\/a> which enables you to configure and immediately provision and spin up new situations without any need of intervention. You need to do this by mounting thresholds and metrics to watch.\u00a0 When individually these thresholds are met, a completely new occasion of a person’s selection will most likely be spun up, configured, and folded into the load balancer pool.\u00a0 Voila, you have scaled horizontally without any operator intervention!\r\n\r\n
\r\n\r\n3)\u00a0What is an AMI?\u00a0 How do I build one?<\/strong>\r\n\r\nAns:\u00a0<\/strong>AMI denotes Amazon Machine Image.\u00a0 It is definitely a picture of the source file system. Useful hardware, servers have bios that denote the master boot record from the first slab on a disk.\u00a0 A disk image, although can sit actually on a disk, Linux can boot from an absolute location on the EBS storage network.\r\n\r\nBuild a new AMI by first rotating up an example from a trusted AMI then add packages and components required.\u00a0 Be cautious of placing sensitive data on an AMI. For example, access credentials of yours should be added to an instance after spinup with a database, position an external volume that operates your MySQL data after spinup as well.\r\n\r\n
\r\n\r\n4)\u00a0Can I vertically scale an Amazon instance?\u00a0 How?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Yes. This is an incredible feature of AWS and cloud virtualization.\u00a0 Spin up a new larger instance than the one you are currently running. Pause that instance and detach the root EBS volume and discard.\u00a0 Then stop your live instance, detach its root volume.\u00a0 Note down the unique device ID and attach that root volume to your new server.\u00a0\u00a0 And then start it again. And, you have scaled vertically in-place!\r\n\r\n
\r\n\r\n5)\u00a0What is Amazon S3?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon S3 (Simple Storage Service) is an object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.\r\n\r\n
\r\n\r\n6)\u00a0What is SimpleDB?<\/strong>\r\n\r\nAns:\u00a0<\/strong>It is a structured data store that supports indexing and data queries to both EC2 and S3.\r\n\r\n
\r\n\r\n7)\u00a0What is the type of architecture, where half of the workload is on the public load while the other half is on the local storage?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Hybrid Cloud Architecture.\r\n\r\n
\r\n\r\n8)\u00a0How can you send a request to Amazon S3?<\/strong>\r\n\r\nAns:\u00a0<\/strong>\u00a0You can send the request by using the REST API<\/a> or the AWS SDK wrapper libraries that wrap the underlying Amazon S3 REST API.\r\n\r\n
\r\n\r\n9)\u00a0How many buckets can be created in AWS by default?<\/strong>\r\n\r\nAns:\u00a0<\/strong>By default, 100 buckets can be created.\r\n\r\n
\r\n\r\n10)\u00a0Should encryption be used for S3?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Encryption should be considered for sensitive data as S3 is a proprietary technology.\r\n\r\n
\r\n\r\n11)\u00a0What are the various AMI design options?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Fully Baked AMI, JeOS (just enough operating system) AMI, and Hybrid AMI.\r\n\r\n
\r\n\r\n12)\u00a0What is Geo Restriction in CloudFront?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Geo-restriction, also known as geoblocking, is used to prevent users in specific geographic locations from accessing content that you\u2019re distributing through a CloudFront web distribution.\r\n\r\n
\r\n\r\n13)\u00a0Explain T2 instances?<\/strong>\r\n\r\nAns:\u00a0<\/strong>T2 instances are designed to provide moderate baseline performance and the capability to burst to higher performance as required by workload.\r\n\r\n
\r\n\r\n14)\u00a0What is AWS Lambda?<\/strong>\r\n\r\nAns:\u00a0<\/strong>\u00a0AWS Lambda is a compute service that lets you run code in the AWS Cloud without provisioning or managing servers.\r\n\r\n
\r\n\r\n15)\u00a0What is a Serverless application in AWS?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The AWS Serverless Application Model (AWS SAM) extends AWS CloudFormation to provide a simplified way of defining the Amazon API Gateway APIs, AWS Lambda functions, and Amazon DynamoDB tables needed by your serverless application.\r\n\r\n
\r\n\r\n16)\u00a0What is the use of Amazon ElastiCache?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory data store or cache in the cloud.\r\n\r\n
\r\n\r\n17)\u00a0Differentiate between stopping and terminating an instance.<\/strong>\r\n\r\nAns:\u00a0<\/strong>When an instance is stopped, it performs a normal shutdown and then transitions to a paused state. When an instance is terminated, it performs a normal shutdown, then the attached Amazon EBS volumes are deleted unless the volume\u2019s deleteOnTermination attribute is set to false.\r\n\r\n
\r\n\r\n18)\u00a0Is it possible to change the private IP addresses of an EC2 while it is running\/stopped in a VPC<\/a>?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The primary private IP address cannot be changed. However, secondary private addresses can be unassigned, assigned or moved between interfaces or instances at any point.\r\n\r\n
\r\n\r\n19)\u00a0Give one instance where you would prefer Provisioned IOPS over Standard RDS storage?<\/strong>\r\n\r\nAns:\u00a0<\/strong>This can happen when you have batch-oriented workloads.\r\n\r\n
\r\n\r\n20)\u00a0What is the importance of buffer in Amazon Web Services?<\/strong>\r\n\r\nAns:\u00a0<\/strong>An Elastic Load Balancer ensures that the incoming traffic is distributed optimally across various AWS<\/a> instances.\u00a0 A buffer will synchronize different components and makes the arrangement additional elastic to a burst of load or traffic. The components are prone to work in an unstable way of receiving and processing the requests. The buffer creates the equilibrium linking various apparatus and crafts them effort at the identical rate to supply more rapid services.\r\n\r\n
\r\n\r\n21)\u00a0What is the way to secure data for carrying in the cloud?<\/strong>\r\n\r\nAns:\u00a0<\/strong>One thing must be ensured that no one should seize the information in the cloud while data is moving from point one to another and also there should not be any leakage with the security key from several storerooms in the cloud. Segregation of information from additional companies\u2019 information and then encrypting it by means of approved methods is one of the options.\r\n\r\n
\r\n\r\n22)\u00a0Name the several layers of Cloud Computing.<\/strong>\r\n\r\nAns:\u00a0<\/strong>Here is a list of layers of the cloud computing\r\n\r\n1)\u00a0PaaS<\/strong>\u00a0\u2013 Platform as a Service\r\n\r\n2)\u00a0IaaS\u00a0<\/strong>\u2013 Infrastructure as a Service\r\n\r\n3)\u00a0SaaS\u00a0<\/strong>\u2013 Software as a Service\r\n\r\n
\r\n\r\n23)\u00a0What are the components involved in Amazon Web Services?<\/strong>\r\n\r\nAns:\u00a0<\/strong>There are 4 components involved, which are as follows.\r\n\r\n1)\u00a0S3<\/strong>: with this, one can retrieve the key information which is 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.\r\n\r\n2)\u00a0Amazon EC2\u00a0<\/strong>instance: helpful to run a large distributed system on the Hadoop cluster. Automatic parallelization and job scheduling can be achieved by this component.\r\n\r\n3)\u00a0Amazon SQS:<\/strong>\u00a0this component acts as a mediator between different controllers. Also worn for cushioning requirements those are obtained by the manager of Amazon.\r\n\r\n4)\u00a0Amazon SimpleDB:<\/strong>\u00a0helps in storing the transitional position log and the errands executed by the consumers.\r\n\r\n
\r\n\r\n24)\u00a0Distinguish between scalability and flexibility?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The aptitude of any scheme to enhance the tasks on hand to its present hardware resources to grip inconsistency in command is known as scalability. This capability to augment the tasks on hand to its present and supplementary hardware property is recognized as flexibility. This enables the industry to summon command without putting in the infrastructure at all.\u00a0 AWS has several configuration management solutions for AWS scalability, flexibility, availability and management.\r\n\r\n
\r\n\r\n25)\u00a0Name the various layers of the cloud architecture?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The 5 layers of cloud architecture<\/a> are listed below:-\r\n\r\n1)\u00a0CC<\/strong>– Cluster Controller\r\n\r\n2)\u00a0SC<\/strong>– Storage Controller\r\n\r\n3)\u00a0CLC<\/strong>– Cloud Controller\r\n\r\n4)\u00a0Walrus<\/strong>\r\n\r\n5)\u00a0NC<\/strong>– Node Controller\r\n\r\n
\r\n\r\n26)\u00a0Which automation gears can help with spinup services?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The API tools can be both used for spinup services and the written scripts. These scripts could be coded in Perl, bash or other languages of preference. The other option is that of patterned administration and stipulating tools such as a dummy or improved descendant. A tool called Scalr can also be used and we can go with a controlled explanation like a RightScale.\r\n\r\n
\r\n\r\n27)\u00a0How do the processes start, stop and terminate works?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Starting and stopping of an instance: If an instance gets stopped or ended, the instance functions a usual power cut and then changes over to a clogged position. You can establish the case afterward since all the EBS volumes of Amazon remain attached. If an instance is in stopping state, then you will not get charged for additional instance.\r\n\r\nFinishing the instance: If an instance gets terminated it tends to perform a typical blackout, so the EBS volumes which are attached will get removed except the volume\u2019s deleteOnTermination characteristic is set to zero. In such cases, the instance will get removed and cannot set it up afterward.\r\n\r\n
\r\n\r\n28)\u00a0What is Amazon EC2 service?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon Elastic Compute Cloud (Amazon EC2) is an Amazon Web service that provides resizable (scalable) computing capacity in the cloud. You can configure security and networking as well as manage storage. It also helps in obtaining and configuring capacity using minimal friction. You can use it to launch as many virtual servers as you need.\r\n\r\n
\r\n\r\n29)\u00a0Compare AWS and OpenStack?<\/strong>\r\n\r\nAns:<\/strong>\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Criteria<\/td>\r\nAWS<\/td>\r\nOpenStack<\/td>\r\n<\/tr>\r\n
License<\/td>\r\nAmazon proprietary<\/td>\r\nOpen Source<\/td>\r\n<\/tr>\r\n
Operating System<\/td>\r\nWhatever cloud administrator provides<\/td>\r\nWhatever AMIs provided by AWS<\/td>\r\n<\/tr>\r\n
Performing repeatable operations<\/td>\r\nThrough templates<\/td>\r\nThrough text files<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n
\r\n\r\n30)\u00a0What are the features of the Amazon EC2 service?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon EC2 provides the following features:\r\n\r\na)\u00a0Virtual computing environment (known as instances)\r\n\r\nb)\u00a0Pre-configured templates for your instances (known as Amazon Machine Images \u2013\u00a0AMIs<\/strong>)\r\n\r\nc)\u00a0Amazon Machine Images\u00a0(AMIs)<\/strong>\u00a0is a complete package that you need for your server (including the operating system and additional software)\r\n\r\nd)\u00a0It provides various configurations of CPU, memory, storage and networking capacity for your instances (known as instance type)\r\n\r\ne)\u00a0It provides secure login information for your instances using key pairs (AWS stores the public key and you can store the private key in a secure place)\r\n\r\nf)\u00a0Storage volumes of temporary data is deleted when you stop or terminate your instance (known as instance store volumes)\r\n\r\ng)\u00a0It provides persistent storage volumes (using Amazon Elastic Block Store \u2013\u00a0EBS<\/strong>)\r\n\r\nh)\u00a0A firewall that enables you to specify the protocols, ports, and source IP ranges that can reach your instances using security groups\r\n\r\ni)\u00a0Static IP addresses for dynamic cloud computing (known as Elastic IP address)\r\n\r\nj)\u00a0It provides metadata (known as tags)\r\n\r\nk)\u00a0It provides virtual networks that are logically isolated from the rest of the\u00a0AWS CLOUD<\/strong>, and that you can optionally connect to your own network (known as virtual private clouds \u2013\u00a0VPCs<\/strong>)\r\n\r\n
\r\n\r\n31)\u00a0What is Amazon Machine Image (AMI)?<\/strong>\r\n\r\nAns:\u00a0<\/strong>An Amazon Machine Image\u00a0(AMI)<\/strong>\u00a0is a template that contains a software configuration (for example, an operating system, an application server, and applications). From an\u00a0AMI<\/strong>, we launch an instance, which is a copy of the\u00a0AMI<\/strong>\u00a0running as a virtual server in the cloud. We can even launch multiple instances of an\u00a0AMI.<\/strong>\r\n\r\n
\r\n\r\n32)\u00a0What is the relation between Instance and AMI?<\/strong>\r\n\r\nAns:\u00a0<\/strong>We can launch different types of instances from a single AMI. An instance type essentially determines the hardware of the host computer used for your instance. Each instance type offers different compute and memory capabilities.\r\n\r\nAfter we launch an instance, it looks like a traditional host, and we can interact with it as we would do with any computer. We have complete control of our instances; we can use it to run commands that require root privileges.\r\n\r\n
\r\n\r\n33)\u00a0Explain storage for Amazon EC2 instance?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon EC2<\/strong>\u00a0provides many data storage<\/a> options for your instances. Each option has a unique combination of performance and durability. These storages can be used independently or in combination to suit your requirements. There are mainly four types of storages provided by AWS.\r\n\r\nAmazon EBS:<\/strong>\u00a0Its durable, block-level storage volumes can attached in running Amazon\u00a0EC2<\/strong>\u00a0instance. The Amazon\u00a0EBS\u00a0<\/strong>volume persists independently from the running life of an Amazon\u00a0EC2\u00a0<\/strong>instance<\/a>. After an\u00a0EBS\u00a0<\/strong>volume is attached to an instance, you can use it like any other physical hard drive. Amazon\u00a0EBS\u00a0<\/strong>encryption feature supports encryption feature.\r\n\r\nAmazon\u00a0EC2<\/strong>\u00a0Instance Store: Storage disk that is attached to the host computer is referred to as instance store. The instance storage provides temporary block-level storage for Amazon\u00a0EC2\u00a0<\/strong>instances. The data on an instance store volume persists only during the life of the associated Amazon\u00a0EC2\u00a0<\/strong>instance; if you stop or terminate an instance, any data on instance store volumes is lost.\r\n\r\nAmazon S3:\u00a0<\/strong>Amazon\u00a0S3\u00a0<\/strong>provides access to reliable and inexpensive data storage infrastructure. It is designed to make web-scale computing easier by enabling you to store and retrieve any amount of data, at any time, from within Amazon\u00a0EC2<\/strong>\u00a0or anywhere on the web.\r\n\r\nAdding Storage: Every time you launch an instance from an\u00a0AMI<\/strong>, a root storage device is created for that instance. The root storage device contains all the information necessary to boot the instance. You can specify storage volumes in addition to the root device volume when you create an\u00a0AMI\u00a0<\/strong>or launch an instance using block device mapping.\r\n\r\n
\r\n\r\n34)\u00a0What are the Security Best Practices for Amazon EC2?<\/strong>\r\n\r\nThere are several best practices for secure Amazon EC2. Following are few of them:-\r\n\r\n1)\u00a0Use AWS Identity and Access Management (IAM) to control access to your AWS resources.\r\n\r\n2) Restrict access by only allowing trusted hosts or networks to access ports on your instance.\r\n\r\n3) Review the rules in your security groups regularly, and ensure that you apply the principle of least\r\n\r\n4) Privilege \u2014 only open up permissions that you require.\r\n\r\n5) Disable password-based logins for instances launched from your AMI. Passwords can be found or cracked, and are a security risk.\r\n\r\n
\r\n\r\n35)\u00a0Explain Elastic Block Storage. What type of performance can you expect?\u00a0 How do you back it up?\u00a0 How do you improve performance?<\/strong>\r\n\r\nAns:\u00a0<\/strong>EBS is a virtualized SAN or storage area network.\u00a0 That means it is RAID storage to start with, so it\u2019s redundant and faults tolerant.\u00a0 If disks die in that RAID you don\u2019t lose data. It is also virtualized, so you can provision and allocate storage, and attach it to your server with various API calls.\u00a0 No calling the storage expert and asking him or her to run specialized commands from the hardware vendor<\/a>.\r\n\r\nPerformance on EBS can exhibit variability.\u00a0 That is, it can go above the SLA performance level then, drop below it.\u00a0 The SLA provides you with an average disk I\/O rate you can expect.\u00a0 This can frustrate some folks, especially performance experts who expect reliable and consistent disk throughout on a server.\u00a0 Traditional physically hosted servers behave that way.\u00a0 Virtual AWS instances do not.\r\n\r\nBackup EBS volumes by using the snapshot facility via API call or via a GUI interface like elasticfox. Improve performance by using Linux software raid and striping across four volumes.\r\n\r\n
\r\n\r\n36)\u00a0What is S3?\u00a0 What is it used for?\u00a0 Should encryption be used?<\/strong>\r\n\r\nAns:\u00a0<\/strong>S3<\/strong>\u00a0stands for Simple Storage Service.\u00a0 You can think of it like FTP storage, where you can move files to and from there, but not mount it like a filesystem.\u00a0 AWS automatically puts your snapshots there, as well as AMIs there.\u00a0 Encryption should be considered for sensitive data, as AWS S3 is a proprietary technology developed by Amazon themselves, and as yet unproven vis-a-vis a security standpoint.\r\n\r\n
\r\n\r\n37)\u00a0\u00a0What automation tools can I use to spin up servers?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The most obvious way is to roll-your-own scripts and use the AWS API tools.\u00a0 Such scripts could be written in bash, Perl or another language of preference. The next option is to use a configuration management and provisioning tools like Opscode Chef or Scalr. Lastly, you can go with a managed solution such as RightScale.\r\n\r\n
\r\n\r\n38)\u00a0What is configuration management?\u00a0 Why would I want to use it with cloud provisioning of resources?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Configuration management has been around for a long time in web operations and systems administration. Yet the cultural popularity of it has been limited.\u00a0 Most systems administrators configure machines as the software was developed before version control \u2013 that is manually making changes on servers.\u00a0 Each server can then and usually is slightly different.\u00a0 Troubleshooting though is straightforward as you log in to the box and operate on it directly.\u00a0 Configuration management brings a large automation tool in the picture, managing servers like strings of a puppet.\u00a0 This forces standardization, best practices, and reproducibility as all configurations are versioned and managed.\u00a0 It also introduces a new way of working which is the biggest hurdle to its adoption.\r\n\r\nOnce you enter the cloud, then configuration management becomes even more critical.\u00a0 That\u2019s because virtual servers such as Amazon’s EC2 instances are much less reliable than physical ones.\u00a0 You absolutely need a mechanism to rebuild them as-is at any moment.\u00a0 This pushes best practices like automation, reproducibility and disaster recovery into center stage.\r\n\r\n
\r\n\r\n39)\u00a0Explain how you would simulate perimeter security using the Amazon Web Services model?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Traditional perimeter security that we\u2019re already familiar with using firewalls and so forth is not supported in the Amazon EC2 world.\u00a0 AWS supports security groups.\u00a0 One can create a security group for a jump box with ssh access \u2013 only port 22 open.\u00a0 From there a web server group and database group are created.\u00a0 The web server group allows 80 and 443 from the world, but port 22 *only* from the jump box group.\u00a0 Further, the database group allows port 3306 from the web server group and port 22 from the jump box group.\u00a0 Add any machines to the web server group and they can all hit the database.\u00a0 No one from the world can, and no one can directly ssh to any of your boxes.\r\n\r\n
\r\n\r\n40)\u00a0How to use Amazon SQS?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Amazon SQS (Simple Queue Service) is a message passing mechanism that is used for communication between different connectors that are connected with each other. It also acts as a communicator between various components of Amazon. It keeps all the different functional components together. This functionality helps different components to be loosely coupled, and provide an AWS architecture that is more failure resilient system.\r\n\r\n
\r\n\r\n41)\u00a0I have some private servers on my premises, also I have distributed some of my workloads on the public cloud, what is this architecture called?<\/strong>\r\n\r\nAns:\u00a0<\/strong>A.<\/strong>\u00a0Virtual Private Network\r\n\r\nB.<\/strong>\u00a0Private Cloud\r\n\r\nC.<\/strong>\u00a0Virtual Private Cloud\r\n\r\nD.<\/strong>\u00a0Hybrid Cloud\r\n\r\nAnswer\u00a0D.<\/strong>\r\n\r\nExplanation: This type of architecture would be a hybrid cloud because we are using both, the public cloud and on-premises servers i.e the private cloud. To make this hybrid architecture easy to use, it\u2019d be better if the private and public cloud were all on the same network(virtually). This is established by including your public cloud servers in a virtual private cloud and connecting this virtual cloud with your on-premise servers using a VPN (Virtual Private Network).\r\n\r\n
\r\n\r\n42)\u00a0\u00a0What does the following command do with respect to the Amazon EC2 security groups?<\/strong>\r\n\r\nAns:\u00a0 \u00a0A.<\/strong>\u00a0Groups the user created security groups into a new group for easy access.\r\n\r\nB.<\/strong>\u00a0Creates a new security group for use with your account.\r\n\r\nC.<\/strong>\u00a0Creates a new group inside the security group.\r\n\r\nD.<\/strong>\u00a0Creates a new rule inside the security group.\r\n\r\nAnswer\u00a0B.<\/strong>\r\n\r\nExplanation: A Security group is just like a firewall, it controls the inbound and outbound traffic in and out of your instance. The command mentioned says to create a security group, and its function is the same. Moving along, once your security group is created, you can add different rules to it. For example, you have an RDS instance, to access it, you have to add the public IP address of the machine from which you want to access the instance in its security group.\r\n\r\n
\r\n\r\n43)\u00a0You have a video transcoding application. The videos are processed according to a queue. If the processing of a video is interrupted in one instance, it is resumed in another instance. Currently, there is a huge back-log of videos which needs to be processed, for this you need to add more instances, but you need these instances only until your backlog is reduced. Which of these would be an efficient way to do it?<\/strong>\r\n\r\nAns:\u00a0<\/strong>You should be using an On Demand instance for the same. The reasons being, the workload has to be processed now, meaning it is urgent, secondly you don\u2019t need them once your backlog is cleared, therefore Reserved Instance is out of the picture, and since the work is urgent, you cannot stop the work on your instance just because the spot price spiked, therefore Spot Instances shall also not be used. Hence On-Demand instances shall be the right choice in this case.\r\n\r\n
\r\n\r\n44)\u00a0You have a distributed application that periodically processes large volumes of data across multiple Amazon EC2 Instances. The application is designed to recover gracefully from Amazon EC2 instance failures. You are required to accomplish this task in the most cost-effective way?<\/strong>\r\n\r\nWhich of the following will meet your requirements?<\/strong>\r\n\r\nAns:\u00a0 \u00a0<\/strong>A.<\/strong>\u00a0Spot Instances\r\n\r\nB.<\/strong>\u00a0Reserved instances\r\n\r\nC.<\/strong>\u00a0Dedicated Instances\r\n\r\nD.<\/strong>\u00a0On-Demand Instances\r\n\r\nAnswer:\u00a0A<\/strong>\r\n\r\nSince the work we are addressing here is not continuous, a reserved instance shall be idle at times, same goes with On Demand instances. Also, it does not make sense to launch an On-Demand instance whenever work comes up since it is expensive. Hence Spot Instances will be the right fit because of their low rates and no long-term commitments.\r\n\r\n
\r\n\r\n45)\u00a0How is stopping and terminating an instance different from each other?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Starting, stopping and terminating are the three states in an EC2 instance, let\u2019s discuss them in detail:\r\n\r\na)\u00a0<\/strong>Stopping and Starting an instance: When an instance is stopped, the instance performs a normal shutdown and then transitions to a stopped state. All of its Amazon EBS volumes remain attached, and you can start the instance again at a later time. You are not charged for additional instance hours while the instance is in a stopped state.\r\n\r\nb)\u00a0<\/strong>Terminating an instance: When an instance is terminated, the instance performs a normal shutdown, then the attached Amazon EBS volumes are deleted unless the volume\u2019s deleteOnTermination attribute is set to false. The instance itself is also deleted, and you can\u2019t start the instance again at a later time.\r\n\r\n
\r\n\r\n46)\u00a0If I want my instance to run on a single-tenant hardware, which value do I have to set the instance\u2019s tenancy attribute to?<\/strong>\r\n\r\nAns:\u00a0<\/strong>\u00a0\u00a0A.<\/strong>\u00a0Dedicated\r\n\r\nB.<\/strong>\u00a0Isolated\r\n\r\nC.<\/strong>\u00a0One\r\n\r\nD.<\/strong>\u00a0Reserved\r\n\r\nAnswer\u00a0A.<\/strong>\r\n\r\nThe Instance tenancy attribute should be set to Dedicated Instance. The rest of the values are invalid.\r\n\r\n
\r\n\r\n47)\u00a0When will you incur costs with an Elastic IP address (EIP)?<\/strong>\r\n\r\nAns:\u00a0 \u00a0<\/strong>A.<\/strong>\u00a0When an EIP is allocated.\r\n\r\nB.<\/strong>\u00a0When it is allocated and associated with a running instance.\r\n\r\nC.<\/strong>\u00a0When it is allocated and associated with a stopped instance.\r\n\r\nD.<\/strong>\u00a0Costs are incurred regardless of whether the EIP is associated with a running instance.\r\n\r\nAnswer\u00a0C.<\/strong>\r\n\r\nYou are not charged, if only one Elastic IP address is attached to your running instance. But you do get charged under the following conditions:\r\n\r\n\u2022 When you use more than one Elastic IPs with your instance.\r\n\r\n\u2022 When your Elastic IP is attached to a stopped instance.\r\n\r\n\u2022 When your Elastic IP is not attached to any instance.\r\n\r\n
\r\n\r\n48)\u00a0How is a Spot instance different from an On-Demand instance or Reserved Instance?<\/strong>\r\n\r\nAns:\u00a0<\/strong>Firstly, Spot Instance, On-Demand instance and Reserved Instances are all models for pricing. Moving along, spot instances provide the ability for customers to purchase compute capacity with no upfront commitment, at hourly rates usually lower than the On-Demand rate in each region. Spot instances are just like bidding, the bidding price is called Spot Price. The Spot Price fluctuates based on supply and demand for instances, but customers will never pay more than the maximum price they have specified. If the Spot Price moves higher than a customer\u2019s maximum price, the customer\u2019s EC2 instance will be shut down automatically. But the reverse is not true, if the Spot prices come down again, your EC2 instance will not be launched automatically, one has to do that manually.\u00a0 In Spot and On-demand instance, there is no commitment for the duration from the user side, however in reserved instances, one has to stick to the time period that he has chosen.\r\n\r\n
\r\n\r\n49)\u00a0Are the Reserved Instances available for Multi-AZ Deployments?<\/strong>\r\n\r\nAns:\u00a0 \u00a0<\/strong>A.<\/strong>\u00a0Multi-AZ Deployments are only available for Cluster Compute instances types\r\n\r\nB.<\/strong>\u00a0Available for all instance types\r\n\r\nC.<\/strong>\u00a0Only available for M3 instance types\r\n\r\nD.<\/strong>\u00a0Not Available for Reserved Instances\r\n\r\nAnswer\u00a0B.<\/strong>\r\n\r\nReserved Instances is a pricing model, which is available for all instance types in EC2.\r\n\r\n
\r\n\r\n50)\u00a0How to use the processor state control feature available on the c4.8xlarge instance?<\/strong>\r\n\r\nAns:\u00a0<\/strong>The processor state control consists of 2 states:\r\n\r\na)\u00a0<\/strong>The C state \u2013 Sleep state varying from c0 to c6. C6 is the deepest sleep state for a processor\r\n\r\nb)<\/strong>\u00a0The P state \u2013 Performance state p0 being the highest and p15 being the lowest possible frequency.\r\n\r\nThe C state and P state are used as Processors have cores; these cores need thermal headroom to boost their performance. Since all the cores are on the processor the temperature should be kept at an optimal state so that all the cores can perform at the highest performance.\r\n\r\nNow how will these states help in that? If a core is put into sleep state it will reduce the overall temperature of the processor and hence other cores can perform better. Now the same can be synchronized with other cores so that the processor can boost as many cores it can by timely putting other cores to sleep, and thus get an overall performance boost.\r\n\r\nConcluding, the C and P state can be customized in some EC2 instances like the c4.8xlarge instance and thus you can customize the processor according to your workload.\r\n\r\nIf you like this article, and wish to know more on AWS, click here<\/a> and read up.\r\n\r\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section bb_built=”1″ prev_background_color=”#000000″][et_pb_row][et_pb_column type=”4_4″][et_pb_team_member _builder_version=”3.0.106″ name=”Chandanakatta” position=”Author” facebook_url=”” twitter_url=”” google_url=”” linkedin_url=”” background_layout=”light” image_url=”https:\/\/asha24.net\/blog\/\/wp-content\/uploads\/2018\/03\/portraits-circle-small_1.png” header_font=”Titillium Web|700|||||||” body_font=”Titillium Web||||||||” body_font_size=”16″ body_font_size_last_edited=”on|desktop” disabled=”off” disabled_on=”off|off|”]\r\n\r\nHey there! I shoot some hoops when I\u2019m not drowned in the books, sitting by the side of brooks.\r\n\r\n[\/et_pb_team_member][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":47388,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[57],"tags":[58,60],"class_list":["post-47387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interview-questions","tag-interview-questions","tag-resume"],"yoast_head":"\nAmazon Web Services Interview Questions and Answers - Interview Tips - Asha24 Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/asha24.net\/blog\/amazon-web-services-interview-questions-and-answers-interview-tips\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Amazon Web Services Interview Questions and Answers - 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