Amazon web services interview questions

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What isAmazonWeb Services(AWS)?
Amazon Web Services (AWS) provides computing resources and services (together make up a cloud
computing platform) that you can use to build applications within minutes at pay-as-you-go pricing. For
example, you can rent a server on AWS that you can connect to, configure, secure, and run just as you
would a physical server. The difference is the virtual server runs on top of a planet-scale network
managedbyAWS.
2. What is S3? What isit usedfor? Shouldencryptionbe used?
S3 stands for Simple Storage Service. You can think of it like ftp storage, where you can move files to
and from there, but not mountit like a filesystem. AWS automatically puts your snapshots there, as well
as AMIs there. Encryption should be considered for sensitive data, as S3 is a proprietary technology
developedbyAmazonthemselves,andasyetunprovenvis-a-visasecuritystandpoint.
3. What is an AMI? How do I buildone?
AMI stands for Amazon Machine Image. It is effectively a snapshot of the root filesystem. Commodity
hardware servers have a bios that points the the master boot record of the first block on a disk. A disk
image though can sit anywhere physically on a disk, so Linux can boot from an arbitrary location on the
EBS storage network.

Build a new AMI by first spinning up and instance from a trusted AMI. Then adding packages and
components as required. Be wary of putting sensitive data onto an AMI. For instance your access
credentials should be added to an instance after spinup. With a database, mount an outside volume
that holdsyourMySQL data afterspinupas well.
4. Can I verticallyscale anAmazoninstance? How?
Yes. This is an incredible feature of AWS and cloud virtualization. Spinup a new larger instance than the
one you are currently running. Pause that instance and detach the root ebs volume from this server and
discard. Then stop your live instance, detach its root volume. Note the unique device ID and attach that
root volume toyournewserver. Andthe start it again. Voilayouhave scaledverticallyin-place!!
5. What is auto-scaling? Howdoesitwork?
Autoscaling is a feature of AWS which allows you to configure and automatically provision and spinup
new instances without the need for your intervention. You do this by setting thresholds and metrics to
monitor. When those thresholds are crossed a new instance of your choosing will be spun up,
configured, and rolledinto the load balancer pool. Voila you've scaled horizontally without any operator
intervention!
6. What automationtoolscan I use to spinupservers?
The most obvious way is to roll-your-own scripts, and use the AWS API tools. Such scripts could be
written in bash, perl or other language or your choice. Next option is to use a configuration
management and provisioning tool like puppet or better it's successor Opscode Chef. You might also
looktowardsa tool like Scalr. Lastlyyou can go witha managedsolutionsuchasRightscale.

In VPCswithprivate andpublicsubnets,databaseserversshouldideallybe launchedinto:
The publicsubnet
The private subnet
Eitherof them
Notrecommended,theyshouldideallybe launchedoutsideVPC
An instance is connected to an ENI (Elastic Network Interface) in one subnet. What happens when you
attach an ENI of a differentsubnettothisinstance?
The instance followsthe rulesof the oldersubnet
The instance followsthe rulesof boththe subnets
The instance followsthe rulesof the newersubnet
Notpossible cannotbe connectedto2 ENIs
You want to use Route53 to direct your www sub-domain to an elastic load balancer fronting your web
servers.Whatkindof record setshouldyoucreate?
A.
AAAA
NS
CNAME
You have created 4 weighted resource record sets with weights 1, 2, 3 and 4. the 3rd record set is
selectedbyRoute53:
1/7th of the time
3/10th of the time
3/7th of the time
1/4th of the time

You have created a Route 53 latency record set from your domain to a machine in Singapore and a
similar record to a machine in Oregon. When a user located in India visits your domain he will be routed
to:
Singapore
Oregon
Dependsonthe loadon eachmachine
Both,because 2 requestsare made,1 to each machine
Whichof the followingcanbe usedas an originserverinCloudFront?(Choose 3)
A webserverrunningonEC2
A webserverrunninginyourowndatacenter
A RDS instance
An AmazonS3 bucket
In CloudFront what happens when content is NOT present at an Edge location and a request is made to
it?
An Error 404 notfoundisreturned
CloudFront delivers the content directly from the origin server and stores it in the cache of the edge
location
The requestiskepton holdtill contentisdeliveredtothe edge location
The requestisroutedto the nextclosestedge location
Whichof the followingistrue withrespecttoservingprivate contentthroughCloudFront?
SignedURLs can be createdto access objectsfromCloudFrontedge locations
Directaccess to S3 URLs can be removed therefore allowingaccessonlythroughCloudFrontURLs
Mark the S3 bucketprivate andallowaccessto CloudFrontbymeansof Roles
Mark the S3 bucketprivate andand create an OriginAccessIdentitytoaccessthe objects

You have written a CloudFormation template that creates 1 elastic load balancer fronting 2 EC2
instances. Which section of the template should you edit so that the DNS of the load balancer is
returneduponcreationof the stack.
Resources
Parameters
Outputs
Mappings
Answers:
1) a
2) b
3) b
4) d
5) b
6) a
7) a, b, d
8) b

9) a, b, d
10) c
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Amazon web services interview questions

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Amazon web services interview questions