Interview Questions and Answers for 'Web' | Search Interview Question

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Q301. How would you securely migrate a database to RDS?

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Q302. What are the different types of AWS Load Balancers ?

Amazon Web Services (AWS)

Ans. Application , Network and Classic

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Q303. Difference between internal and external Load Balancer ?

Amazon Web Services (AWS)

Ans. Internal Load balancer is used for services which are for internal consumption only and hence doesn't need to direct Web traffic.

External Load balancers are for regulating web traffic.

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Q304. Are CloudWatch metrics available with free tier ?

Amazon Web Services (AWS)

Ans. Only Basic not advanced

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Q305. What are the Default metrics available for EC2 in CloudWatch ?

Amazon Web Services (AWS)

Ans. CPU, Disk, Network, Status

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Q306. How frequently Cloudwatch monitor AWS services for generating metrics ?

Amazon Web Services (AWS)

Ans. 5 mins for Standard / Basic
1 min for Detailed / advanced

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Q307. Difference between CloudWatch and CloudTrail ?

Amazon Web Services (AWS)

Ans. CloudWatch is for monitoring resources whereas CloudTrail is for auditing activity.

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Q308. Somebody changed the permissions on a S3 bucket, Which Aws service can help locate the user who performed the action ?

Amazon Web Services (AWS)

Ans. CloudTrail

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Q309. Are you using Auto Scaling for your EC2 instances ? How have you configured Auto scaling policy ?

Amazon Web Services (AWS)

Ans. yes, you can create auto scaling policy to set max and min no of instance.

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Q310. What are different types of EC2 Placement Groups in AWS ? What is the difference between them ?

Amazon Web Services (AWS)

Ans. Clustered and Spread

All instances in Clustered group is in same availability zone and whereas instances in spread could be in different az or regions.

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Q311. Can we use all EC2 instance types in placement group ?

Amazon Web Services (AWS)

Ans. No, only the following type are allowed

Compute Optimized
GPU
Memory Optimized
Storage Optimized

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Q312. Can we merge placement groups ?

Amazon Web Services (AWS)

Ans. No

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Q313. Can we move an existing instance to a placement group ?

Amazon Web Services (AWS)

Ans. No but we can create an AMI and then launch a new instance in placement group.

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Q314. Difference between Containerization and Serverless ?

Infrastructure

Ans. Following are key differences between containers and serverless:

Supported host environments: Containers can run on any modern Linux server, as well as certain versions of Windows. In contrast, serverless runs on specific host platforms, most of which are based in the public cloud (like AWS Lambda or Azure Functions).

Self-servicing ability. For the reasons just noted, in most cases, serverless functions require you to use a public cloud. (There are on-premises serverless frameworks, like Fn, but these are not yet widely used.) With containers, you can set up your own on-premises host environment, or use a public cloud service like ECS.

Cost. Because serverless environments are hosted in the cloud, you have to pay to use them. In contrast, you can set up a container environment yourself using open source code for free (although you’ll still have management costs, of course).

Supported languages. You can containerize an application written in any type of language as long as the host server supports the language. Serverless frameworks are different; they support a limited number of languages. The details of supported serverless language vary from serverless platform to platform.

Statefulness. Most serverless platforms are designed to support stateless workloads. (Some serverless providers offer limited support for stateful services; cf. Durable Functions on Azure.) Although you can connect to external storage services (like S3 on AWS) from within serverless platforms, the functions themselves cannot be stateful. Containers present their own persistent storage challenges, but creating stateful containerized apps is certainly possible.

Availability. Serverless functions are designed to run for a short period—usually, a few hundred seconds—before they shut down. Containers can run for as long as you need.

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Q315. What are the factors on which Lambda usage is priced ?

Amazon Web Services (AWS)

Ans. No of requests, computation duration, assigned RAM

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Q316. Can we associate a single EBS volume with multiple EC2 instances ?

Amazon Web Services (AWS)

Ans. No

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Q317. Can we attach single volume to multiple Ec2 instances ?

Amazon Web Services (AWS)

Ans. Yes EFS volumes but not EBS

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Q318. What is the use case of having Code Commit trigger within AWS Lambda ?

Amazon Web Services (AWS)

Ans. If we would like a program to be executed if someone commits code to the repository.

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Q319. Why serverless is called serverless if there are actually servers serving the requests ?

Infrastructure

Ans. Because Vendors need not worry about provisioning , managing and maintaining the servers and it's intrinsically taken care of by AWS.

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Q320. What is Amazon Polly ?

Amazon Web Services (AWS)

Ans. It's a service to convert text to speech.

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Q321. Why it takes longer to create first volume snapshot but subsequent snapshots are faster ?

Amazon Web Services (AWS)

Ans. Because AWS stores subsequent snapshots as only incremental information.

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Q322. Can we delete a snapshot of EBS that is used as the root device of a registered AMI ?

Amazon Web Services (AWS)

Ans. No, We need to de register it first.

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Q323. What is the use case of AWS Placement Group ?

Amazon Web Services (AWS)

Ans. Computing that would require high network throughput and low latency within a single availability zone.

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Q324. What is the DNS port no ?

Networking

Ans. 53

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Q325. How does Route53 support naked domain names ?

Amazon Web Services (AWS)

Ans. Through Aliasis

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Q326. Difference between Route53 aliasis and cname ?

Amazon Web Services (AWS)

Ans. Cname doesn't support naked domain names whereas aliasis does.

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Q327. What are the advantages of using Aliasis over Cname in Route53 ?

Amazon Web Services (AWS)

Ans. 1. Supports naked domain names
2. Any change in ELB IP is automatically updated in Route53

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Q328. What is the default limit of domain supported by Route 53 ?

Amazon Web Services (AWS)

Ans. 50

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Q329. Difference between multi AZ RDS and Read replicas ?

Amazon Web Services (AWS)

Ans. Multi AZ RDS is for disaster recovery and failover whereas Read replicas are for scaling.

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Q330. What is the limit of read replicas per database ?

Amazon Web Services (AWS)

Ans. 5

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