Brigan Enser
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Quiz on AWS, created by Brigan Enser on 06/07/2017.

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Brigan Enser
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AWS

AWS

Question 1 of 55

1

A startups photo-sharing site is deployed in a VPC. An ELB distributes web traffic across
two subnets. ELB session stickiness is configured to use the AWS-generated session
cookie, with a session TTL of 5 minutes. The webserver Auto Scaling Group is configured
as: min-size=4, max-size=4. The startups preparing for a public launch, by running
load-testing software installed on a single EC2 instance running in us-west-2a. After 60
minutes of load-testing, the webserver logs show: Which recommendations can help ensure
load-testing HTTP requests are evenly distributed across the four webservers? Choose 2
answers.

Select one or more of the following:

  • Re-configure the load-testing software to re-resolve DNS for each web request.

  • Use a 3rd-party load-testing service which offers globally-distributed test clients.

  • Configure ELB and Auto Scaling to distribute across us-west-2a and us-west-2c.

  • Configure ELB session stickiness to use the app-specific session cookie.

  • Launch and run the load-tester EC2 instance from us-east-1 instead.

Explanation

Question 2 of 55

1

Which of the following are correct statements with policy evaluation logic in AWS Identity
and Access Management? Choose 2 answers

Select one or more of the following:

  • An explicit deny does not override an explicit allow

  • By default, all request are allowed

  • An explicit allow overrides default deny

  • An explicit allow overrides an explicit deny

  • By default, all requests are denied

Explanation

Question 3 of 55

1

How can you secure data at rest on an EBS volume?

Select one of the following:

  • Write the data randomly instead of sequentially.

  • Use an encrypted file system on top of the EBS volume.

  • Encrypt the volume using the S3 server-side encryption service.

  • Create an IAM policy that restricts read and write access to the volume.

  • Attach the volume to an instance using EC2’s SSL interface.

Explanation

Question 4 of 55

1

If an application is storing hourly log files from thousands of instances from a high traffic
web site, which naming scheme would give optimal performance on S3?

Select one of the following:

  • Sequential

  • HH-DD-MM-YYYY-log_instanceID

  • YYYY-MM-DD-HH-log_instanceID

  • instanceID_log-HH-DD-MM-YYYY

  • instanceID_log-YYYY-MM-DD-HH

Explanation

Question 5 of 55

1

Your application is trying to upload a 6 GB file to Simple Storage Service and receive a
“Your proposed upload exceeds the maximum allowed object size.” error message. What is
a possible solution for this?

Select one of the following:

  • None, Simple Storage Service objects are limited to 5 GB

  • Use the multi-part upload API for this object

  • Use the large object upload API for this object

  • Contact support to increase your object size limit

  • Upload to a different region

Explanation

Question 6 of 55

1

Company C is currently hosting their corporate site in an Amazon S3 bucket with Static
Website Hosting enabled. Currently, when visitors go to http://www.companyc.com the
index.html page is returned. Company C now would like a new page welcome.html to be
returned when a visitor enters http://www.companyc.com in the browser. Which of the
following steps will allow Company C to meet this requirement? Choose 2 answers

Select one or more of the following:

  • Upload an html page named welcome.html to their S3 bucket

  • Create a welcome subfolder in their S3 bucket

  • Set the Index Document property to welcome.html

  • Move the index.html page to a welcome subfolder

  • Set the Error Document property to welcome.html

Explanation

Question 7 of 55

1

Which of the following statements about SQS is true?

Select one of the following:

  • Messages will be delivered one or more times and messages will be delivered in First in,
    First out order

  • Messages will be delivered exactly once and message delivery order is indeterminate

  • Messages will be delivered exactly once and messages will be delivered in First in, First
    out order

  • Messages will be delivered one or more times and message delivery order is
    indeterminate

Explanation

Question 8 of 55

1

EC2 instances are launched from Amazon Machine images (AMIS). A given public AMI can:

Select one of the following:

  • be used to launch EC2 Instances in any AWS region.

  • only be used to launch EC2 instances in the same country as the AMI is stored.

  • only be used to launch EC2 instances in the same AWS region as the AMI is stored.

  • only be used to launch EC2 instances in the same AWS availability zone as the AMI is
    stored.

Explanation

Question 9 of 55

1

When a Simple Queue Service message triggers a task that takes 5 minutes to complete,
which process below will result in successful processing of the message and remove it from
the queue while minimizing the chances of duplicate processing?

Select one of the following:

  • Retrieve the message with an increased visibility timeout, delete the message from the
    queue, process the message

  • Retrieve the message with increased DelaySeconds, process the message, delete the
    message from the queue

  • Retrieve the message with an increased visibility timeout, process the message, delete
    the message from the queue

  • Retrieve the message with increased DelaySeconds, delete the message from the
    queue, process the message

Explanation

Question 10 of 55

1

What is the format of structured notification messages sent by Amazon SNS?

Select one of the following:

  • An XML object containing MessageId, UnsubscribeURL, Subject, Message and other
    values

  • An JSON object containing MessageId, DuplicateFlag, Message and other values

  • An XML object containing MessageId, DuplicateFlag, Message and other values

  • An JSON object containing MessageId, unsubscribeURL, Subject, Message and other
    values

Explanation

Question 11 of 55

1

Which approach below provides the least impact to provisioned throughput on the “Product”
table?

Select one of the following:

  • Create an “Images” DynamoDB table to store the Image with a foreign key constraint to
    the “Product” table

  • Add an image data type to the “Product” table to store the images in binary format

  • Serialize the image and store it in multiple DynamoDB tables

  • Store the images in Amazon S3 and add an S3 URL pointer to the “Product” table item
    for each image

Explanation

Question 12 of 55

1

Which DynamoDB limits can be raised by contacting AWS support? Choose 2 answers

Select one or more of the following:

  • The number of hash keys per account

  • The maximum storage used per account

  • The number of tables per account

  • The number of local secondary indexes per account

  • The number of provisioned throughput units per account

Explanation

Question 13 of 55

1

Which of the following items are required to allow an application deployed on an EC2
instance to write data to a DynamoDB table? Assume that no security Keys are allowed to
be stored on the EC2 instance. Choose 2 answers

Select one or more of the following:

  • Create an IAM User that allows write access to the DynamoDB table.

  • Launch an EC2 Instance with the IAM User included in the launch configuration.

  • Create an IAM Role that allows write access to the DynamoDB table.

  • Launch an EC2 Instance with the IAM Role included in the launch configuration.

  • Add an IAM Role to a running EC2 instance.

  • Add an IAM User to a running EC2 Instance.

Explanation

Question 14 of 55

1

Which EC2 API call would you use to retrieve a list of Amazon Machine Images (AMIs)?

Select one of the following:

  • DescnbeInstances

  • You cannot retrieve a list of AMIs as there are over 10,000 AMIs

  • GetAMls

  • DescribeImages

  • DescribeAMIs

Explanation

Question 15 of 55

1

An Amazon S3 bucket, “myawsbucket” is configured with website hosting in Tokyo region,
what is the region-specific website endpoint?

Select one of the following:

  • www.myawsbucket.ap-northeast-1.amazonaws.com

  • myawsbucket.s3-website-ap-northeast-l.amazonawscom

  • myawsbucket.amazonaws.com

  • myawsbucket.tokyo.amazonaws.com

Explanation

Question 16 of 55

1

A corporate web application is deployed within an Amazon VPC, and is connected to the
corporate data center via IPSec VPN. The application must authenticate against the
on-premise LDAP server. Once authenticated, logged-in users can only access an S3
keyspace specific to the user. Which two approaches can satisfy the objectives? Choose 2
answers

Select one or more of the following:

  • The application authenticates against LDAP, and retrieves the name of an IAM role
    associated with the user. The application then calls the IAM Security Token Service to
    assume that IAM Role. The application can use the temporary credentials to access the
    appropriate S3 bucket.

  • Develop an identity broker which authenticates against IAM Security Token Service to
    assume an IAM Role to get temporary AWS security credentials. The application calls the
    identity broker to get AWS temporary security credentials with access to the appropriate S3
    bucket.

  • The application authenticates against IAM Security Token Service using the LDAP
    credentials. The application uses those temporary AWS security credentials to access the
    appropriate S3 bucket.

  • The application authenticates against LDAP. The application then calls the IAM Security
    Service to login to IAM using the LDAP credentials. The application can use the IAM
    temporary credentials to access the appropriate S3 bucket.

  • Develop an identity broker which authenticates against LDAP, and then calls IAM
    Security Token Service to get IAM federated user credentials. The application calls the
    identity broker to get IAM federated user credentials with access to the appropriate S3
    bucket.

Explanation

Question 17 of 55

1

You are providing AWS consulting services for a company developing a new mobile
application that will be leveraging Amazon SNS Mobile Push for push notifications. In order
to send direct notification messages to individual devices each device registration identifier
or token needs to be registered with SNS; however the developers are not sure of the best
way to do this. You advise them to:

Select one of the following:

  • Call the CreatePlatformEndPoint API function to register multiple device tokens.

  • Bulk upload the device tokens contained in a CSV file via the AWS Management
    Console.

  • Let the push notification service (e.g. Amazon Device Messaging) handle the registration.

  • Implement a token vending service to handle the registration.

Explanation

Question 18 of 55

1

What type of block cipher does Amazon S3 offer for server side encryption?

Select one of the following:

  • RC5

  • Blowfish

  • Triple DES

  • Advanced Encryption Standard

Explanation

Question 19 of 55

1

You have written an application that uses the Elastic Load Balancing service to spread
traffic to several web servers Your users complain that they are sometimes forced to login
again in the middle of using your application, after they have already togged in. This is not
behavior you have designed. What is a possible solution to prevent this happening?

Select one of the following:

  • Use instance memory to save session state.

  • Use instance storage to save session state.

  • Use EBS to save session state

  • Use ElastiCache to save session state.

  • Use Glacier to save session slate.

Explanation

Question 20 of 55

1

Which of the following is an example of a good DynamoDB hash key schema for
provisioned throughput efficiency?

Select one of the following:

  • User ID, where the application has many different users.

  • Status Code where most status codes are the same.

  • Device ID, where one is by far more popular than all the others.

  • Game Type, where there are three possible game types.

Explanation

Question 21 of 55

1

Which statements about DynamoDB are true? Choose 2 answers

Select one or more of the following:

  • DynamoDB uses optimistic concurrency control

  • DynamoDB restricts item access during writes

  • DynamoDB uses a pessimistic locking model

  • DynamoDB restricts item access during reads

  • DynamoDB uses conditional writes for consistency

Explanation

Question 22 of 55

1

You are writing to a DynamoDB table and receive the following exception:”
ProvisionedThroughputExceededException”. though according to your Cloudwatch metrics
for the table, you are not exceeding your provisioned throughput. What could be an
explanation for this?

Select one of the following:

  • You haven’t provisioned enough DynamoDB storage instances

  • You’re exceeding your capacity on a particular Range Key

  • You’re exceeding your capacity on a particular Hash Key

  • You’re exceeding your capacity on a particular Sort Key

  • You haven’t configured DynamoDB Auto Scaling triggers

Explanation

Question 23 of 55

1

Company A has an S3 bucket containing premier content that they intend to make available
to only paid subscribers of their website. The S3 bucket currently has default permissions of
all objects being private to prevent inadvertent exposure of the premier content to
non-paying website visitors. How can Company A provide only paid subscribers the ability
to download a premier content file in the S3 bucket?

Select one of the following:

  • Apply a bucket policy that grants anonymous users to download the content from the S3
    bucket

  • Generate a pre-signed object URL for the premier content file when a paid subscriber
    requests a download

  • Add a bucket policy that requires Multi-Factor Authentication for requests to access the
    S3 bucket objects

  • Enable server side encryption on the S3 bucket for data protection against the
    non-paying website visitors

Explanation

Question 24 of 55

1

What happens, by default, when one of the resources in a CloudFormation stack cannot be
created?

Select one of the following:

  • The stack creation continues, and the final results indicate which steps failed.

  • CloudFormation templates are parsed in advance so stack creation is guaranteed to
    succeed.

  • Previously-created resources are kept but the stack creation terminates.

  • Previously-created resources are deleted and the stack creation terminates.

Explanation

Question 25 of 55

1

What is the maximum number of S3 Buckets available per AWS account?

Select one of the following:

  • There is no limit

  • 100 per account

  • 100 per IAM user

  • 100 per region

  • 500 per account

Explanation

Question 26 of 55

1

Which of the following are valid arguments for an SNS Publish request? Choose 3 answers

Select one or more of the following:

  • Subject

  • Language

  • Message

  • Destination

  • TopicAm

  • Format

Explanation

Question 27 of 55

1

A meteorological system monitors 600 temperature gauges, obtaining temperature samples
every minute and saving each sample to a DynamoDB table. Each sample involves writing
1K of data and the writes are evenly distributed over time. How much write throughput is
required for the target table?

Select one or more of the following:

  • 3600 write capacity units

  • 1 write capacity unit

  • 10 write capacity units

  • 60 write capacity units

  • 600 write capacity units

Explanation

Question 28 of 55

1

Which of the following platforms are supported by Elastic Beanstalk? Choose 2 answers

Select one or more of the following:

  • Apache Tomcat

  • IBM Websphere

  • Oracle JBoss

  • Jetty

  • .NET

Explanation

Question 29 of 55

1

You attempt to store an object in the US-STANDARD region in Amazon S3, and receive a
confirmation that it has been successfully stored. You then immediately make another API
call and attempt to read this object. S3 tells you that the object does not exist What could
explain this behavior?

Select one of the following:

  • US-STANDARD imposes a 1 second delay before new objects are readable.

  • You exceeded the bucket object limit, and once this limit is raised the object will be
    visible.

  • Objects in Amazon S3 do not become visible until they are replicated to a second region.

  • US-STANDARD uses eventual consistency and it can take time for an object to be
    readable in a bucket

Explanation

Question 30 of 55

1

Which features can be used to restrict access to data in S3? Choose 2 answers

Select one or more of the following:

  • Set an S3 Bucket policy.

  • Enable IAM Identity Federation.

  • Set an S3 ACL on the bucket or the object.

  • Create a CloudFront distribution for the bucket.

  • Use S3 Virtual Hosting.

Explanation

Question 31 of 55

1

In AWS, which security aspects are the customer’s responsibility? Choose 4 answers

Select one or more of the following:

  • Decommissioning storage devices

  • Patch management on the EC2 instance’s operating system

  • Controlling physical access to compute resources

  • Security Group and ACL (Access Control List) settings

  • Life-cycle management of IAM credentials

  • Encryption of EBS (Elastic Block Storage) volumes

Explanation

Question 32 of 55

1

What AWS products and features can be deployed by Elastic Beanstalk? Choose 3
answers

Select one or more of the following:

  • Auto scaling groups

  • Route 53 hosted zones

  • Elastic Load Balancers

  • RDS Instances

  • Elastic IP addresses

  • SQS Queues

Explanation

Question 33 of 55

1

You run an ad-supported photo sharing website using S3 to serve photos to visitors of your
site. At some point you find out that other sites have been linking to the photos on your site,
causing loss to your business. What is an effective method to mitigate this?

Select one of the following:

  • Store photos on an EBS volume of the web server

  • Remove public read access and use signed URLs with expiry dates.

  • Use CloudFront distributions for static content.

  • Block the IPs of the offending websites in Security Groups.

Explanation

Question 34 of 55

1

Which code snippet below returns the URL of a load balanced web site created in
CloudFormation with an AWS::ElasticLoadBalancing::LoadBalancer resource name
“ElasticLoad Balancer”?

Select one of the following:

  • “Fn::Join” : [“”. [ “http://”, {“Fn::GetAtr” : [ “ElasticLoadBalancer”,”DNSName”]}]]

  • “Fn::Join” : [“.”, [ “http://”, {“Ref” : “ElasticLoadBalancerDNSName”}]]

  • “Fn::Join” : [“”. [ “http://”, {“Ref” : “ElasticLoadBalancerUrl”}]]

  • “Fn::Join” : [“”. [ “http://”, {“Fn::GetAtr” : [ “ElasticLoadBalancer”,”Url”]}]]

Explanation

Question 35 of 55

1

You are inserting 1000 new items every second in a DynamoDB table. Once an hour these
items are analyzed and then are no longer needed. You need to minimize provisioned
throughput, storage, and API calls. Given these requirements, what is the most efficient way
to manage these Items after the analysis?

Select one of the following:

  • Retain the items in a single table

  • Delete items individually over a 24 hour period

  • Delete the table and create a new table per hour

  • Create a new table per hour

Explanation

Question 36 of 55

1

Which of the following statements about SWF are true? Choose 3 answers

Select one or more of the following:

  • SWF uses deciders and workers to complete tasks

  • SWF requires at least 1 EC2 instance per domain

  • SWF triggers SNS notifications on task assignment

  • SWF requires an S3 bucket for workflow storage

  • SWF tasks are assigned once and never duplicated

  • SWF workflow executions can last up to a year

Explanation

Question 37 of 55

1

Company D is running their corporate website on Amazon S3 accessed from
http//www.companyd.com. Their marketing team has published new web fonts to a separate
S3 bucket accessed by the S3 endpoint https://s3-us-west1. amazonaws.com/cdfonts.
While testing the new web fonts, Company D recognized the web fonts are being blocked
by the browser. What should Company D do to prevent the web fonts from being blocked by
the browser?

Select one of the following:

  • Create a policy on the cdfonts bucket to enable access to everyone

  • Add the Content-MD5 header to the request for webfonts in the cdfonts bucket from the
    website

  • Configure the cdfonts bucket to allow cross-origin requests by creating a CORS
    configuration

  • Enable versioning on the cdfonts bucket for each web font

Explanation

Question 38 of 55

1

How is provisioned throughput affected by the chosen consistency model when reading
data from a DynamoDB table?

Select one of the following:

  • Strongly consistent reads use the same amount of throughput as eventually consistent
    reads

  • Strongly consistent reads use variable throughput depending on read activity

  • Strongly consistent reads use more throughput than eventually consistent reads.

  • Strongly consistent reads use less throughput than eventually consistent reads

Explanation

Question 39 of 55

1

When uploading an object, what request header can be explicitly specified in a request to
Amazon S3 to encrypt object data when saved on the server side?

Select one of the following:

  • x-amz-storage-class

  • Content-MD5

  • x-amz-security-token

  • x-amz-server-side-encryption

Explanation

Question 40 of 55

1

Which of the following are valid SNS delivery transports? Choose 2 answers

Select one or more of the following:

  • SMS

  • DynamoDB

  • HTTP

  • UDP

  • Named Pipes

Explanation

Question 41 of 55

1

You have an environment that consists of a public subnet using Amazon VPC and 3
instances that are running in this subnet. These three instances can successfully
communicate with other hosts on the Internet. You launch a fourth instance in the same
subnet, using the same AMI and security group configuration you used for the others, but
find that this instance cannot be accessed from the Internet. What should you do to enable
internet access?

Select one of the following:

  • Deploy a NAT instance into the public subnet.

  • Modify the routing table for the public subnet

  • Configure a publicly routable IP Address In the host OS of the fourth instance.

  • Assign an Elastic IP address to the fourth instance.

Explanation

Question 42 of 55

1

How can software determine the public and private IP addresses of the Amazon EC2
instance that it is running on?

Select one of the following:

  • Query the appropriate Amazon CloudWatch metric.

  • Use ipconfig or ifconfig command.

  • Query the local instance userdata.

  • Query the local instance metadata.

Explanation

Question 43 of 55

1

Which of the following services are included at no additional cost with the use of the AWS
platform? Choose 2 answers

Select one or more of the following:

  • CloudFormation

  • Simple Workflow Service

  • Elastic Load Balancing

  • Elastic Compute Cloud

  • Simple Storage Service

  • Auto Scaling

Explanation

Question 44 of 55

1

Which of the following programming languages have an officially supported AWS SDK?
Choose 2 answers

Select one or more of the following:

  • PHP

  • Pascal

  • Java

  • SQL

  • Perl

Explanation

Question 45 of 55

1

After launching an instance that you intend to serve as a NAT (Network Address
Translation) device in a public subnet you modify your route tables to have the NAT device
be the target of internet bound traffic of your private subnet. When you try and make an
outbound connection to the Internet from an instance in the private subnet, you are not
successful. Which of the following steps could resolve the issue?

Select one of the following:

  • Attaching a second Elastic Network interface (ENI) to the NAT instance, and placing it in
    the private subnet

  • Attaching an Elastic IP address to the instance in the private subnet

  • Attaching a second Elastic Network Interface (ENI) to the instance in the private subnet,
    and placing it in the public subnet

  • Disabling the Source/Destination Check attribute on the NAT instance

Explanation

Question 46 of 55

1

Which of the following is chosen as the default region when making an API call with an
AWS SDK?

Select one of the following:

  • ap-northeast-1

  • us-west-2

  • us-east-1

  • eu-west-1

  • us-central-1

Explanation

Question 47 of 55

1

When using a large Scan operation in DynamoDB, what technique can be used to minimize
the impact of a scan on a table’s provisioned throughput?

Select one of the following:

  • Set a smaller page size for the scan

  • Prewarm the table by updating all items

  • Use parallel scans

  • Define a range index on the table

Explanation

Question 48 of 55

1

Which of the following services are key/value stores? Choose 3 answers

Select one or more of the following:

  • Amazon ElastiCache

  • Simple Notification Service

  • DynamoDB

  • Simple Storage Service

  • Simple Workflow Service

Explanation

Question 49 of 55

1

An application stores payroll information nightly in DynamoDB for a large number of
employees across hundreds of offices. Item attributes consist of individual name, office
identifier, and cumulative daily hours. Managers run reports for ranges of names working in
their office. One query is. “Return all Items in this office for names starting with A through
E”. Which table configuration will result in the lowest impact on provisioned throughput for
this query?

Select one of the following:

  • Configure the table to have a range index on the name attribute, and a hash index on the
    office identifier

  • Configure a hash index on the name attribute and no range index

  • Configure the table to have a hash index on the name attribute, and a range index on the
    office identifier

  • Configure a hash index on the office Identifier attribute and no range index

Explanation

Question 50 of 55

1

What is one key difference between an Amazon EBS-backed and an instance-store backed
instance?

Select one of the following:

  • Virtual Private Cloud requires EBS backed instances

  • Amazon EBS-backed instances can be stopped and restarted

  • Auto scaling requires using Amazon EBS-backed instances.

  • Instance-store backed instances can be stopped and restarted.

Explanation

Question 51 of 55

1

Company B provides an online image recognition service and utilizes SOS to decouple
system components for scalability The SQS consumers poll the imaging queue as often as
possible to keep end-to-end throughput as high as possible. However, Company B is
realizing that polling in tight loops is burning CPU cycles and increasing costs with empty
responses. How can Company B reduce the number of empty responses?

Select one of the following:

  • Set the imaging queue visibility Timeout attribute to 20 seconds

  • Set the DelaySeconds parameter of a message to 20 seconds

  • Set the Imaging queue ReceiveMessageWaitTimeSeconds attribute to 20 seconds

  • Set the imaging queue MessageRetentionPeriod attribute to 20 seconds

Explanation

Question 52 of 55

1

What item operation allows the retrieval of multiple items from a DynamoDB table in a single
API call?

Select one of the following:

  • GetItem

  • BatchItem

  • GetMultipleItems

  • GetItemRange

Explanation

Question 53 of 55

1

In DynamoDB, what type of HTTP response codes indicate that a problem was found with
the client request sent to the service?

Select one of the following:

  • 5xx HTTP response code

  • 200 HTTP response code

  • 306 HTTP response code

  • 4xx HTTP response code

Explanation

Question 54 of 55

1

If a message is retrieved from a queue in Amazon SQS, how long is the message
inaccessible to other users by default?

Select one of the following:

  • 30 seconds

  • 0 seconds

  • 1 hour

  • 1 day

  • forever

Explanation

Question 55 of 55

1

Games-R-Us is launching a new game app for mobile devices. Users will log into the game
using their existing Facebook account and the game will record player data and scoring
information directly to a DynamoDB table. What is the most secure approach for signing
requests to the DynamoDB API?

Select one of the following:

  • Create an IAM user with access credentials that are distributed with the mobile app to
    sign the requests

  • Distribute the AWS root account access credentials with the mobile app to sign the
    requests

  • Request temporary security credentials using web identity federation to sign the requests

  • Establish cross account access between the mobile app and the DynamoDB table to sign
    the requests

Explanation

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