21 September, 2020

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Total 371 questions Full Exam Access

Question 1

What is a circular dependency in AWS CIoudFormation?

When a Template references an earlier version of itself.

When Nested Stacks depend on each other.

When Resources form a DependOn loop.

When a Template references a region, which references the original Templat

Question 2

Your CTO is very worried about the security of your AWS account. How best can you prevent hackers from completely hijacking your account?

Use short but complex password on the root account and any administrators.

Use AWS IAM Geo-Lock and disallow anyone from logging in except for in your city.

Use MFA on all users and accounts, especially on the root account.

Don\'t write down or remember the root account password after creating the AWS accoun

Question 3

You need to grant a vendor access to your AWS account. They need to be able to read protected messages in a private S3 bucket at their leisure. They also use AWS. What is the best way to accomplish this?

Create an IAM User with API Access Key

Grant the User permissions to access the bucke

Give the vendor the AWS Access Key ID and AWS Secret Access Key for the User.

Create an EC2 Instance Profile on your accoun

Grant the associated IAM role full access to the bucke

Start an EC2 instance with this Profile and give SSH access to the instance to the vendor.

Create a cross-account IAM Role with permission to access the bucket, and grant permission to use the Role to the vendor AWS account.

Generate a signed S3 PUT URL and a signed S3 PUT URL, both with wildcard values and 2 year duration

Pass the URLs to the vendor.

Question 4

You need to process long-running jobs once and only once. How might you do this?

Use an SNS queue and set the visibility timeout to long enough forjobs to process.

Use an SQS queue and set the reprocessing timeout to long enough forjobs to process.

Use an SQS queue and set the visibility timeout to long enough forjobs to process.

Use an SNS queue and set the reprocessing timeout to long enough forjobs to proces

Question 5

What is required to achieve gigabit network throughput on EC2? You already selected cluster-compute, 10GB instances with enhanced networking, and your workload is already network-bound, but you are not seeing 10 gigabit speeds.

Enable biplex networking on your servers, so packets are non-blocking in both directions and there\'s no switching overhead.

Ensure the instances are in different VPCs so you don\'t saturate the Internet Gateway on any one VPC.

Select PIOPS for your drives and mount several, so you can provision sufficient disk throughput.

Use a placement group for your instances so the instances are physically near each other in the same Availability Zone.

Question 6

Which of these is not a CIoudFormation Helper Script?

cfn-signal

cfn-hup

cfn-request

cfn-get-metadata

Question 7

There are a number of ways to purchase compute capacity on AWS. Which orders the price per compute or memory unit from LOW to HIGH (cheapest to most expensive), on average?
(A) On-Demand (B) Spot (C) Reserved

A, B, C

C, B, A

B, C, A

A, C, B

Question 8

Your application consists of 10% writes and 90% reads. You currently service all requests through a Route53 Alias Record directed towards an AWS ELB, which sits in front of an EC2 Auto Scaling Group. Your system is getting very expensive when there are large traffic spikes during certain news events, during which many more people request to read similar data all at the same time. What is the simplest and cheapest way to reduce costs and scale with spikes like this?

Create an S3 bucket and asynchronously replicate common requests responses into S3 object

When a request comes in for a precomputed response, redirect to AWS S3.

Create another ELB and Auto Scaling Group layer mounted on top of the other system, adding a tier to the syste

Serve most read requests out of the top layer.

Create a CloudFront Distribution and direct Route53 to the Distributio

Use the ELB as an Origin and specify Cache Behaviours to proxy cache requests which can be served late.

Create a Memcached cluster in AWS EIastiCach

Create cache logic to serve requests which can be served late from the in-memory cache for increased performance.

Question 9

You need your CI to build AMIs with code pre-installed on the images on every new code push. You need to do this as cheaply as possible. How do you do this?

Bid on spot instances just above the asking price as soon as new commits come in, perform all instance configuration and setup, then create an AMI based on the spot instance.

Have the CI launch a new on-demand EC2 instance when new commits come in, perform all instance configuration and setup, then create an AMI based on the on-demand instance.

Purchase a Light Utilization Reserved Instance to save money on the continuous integration machin

Use these credits whenever your create AMIs on instances.

When the CI instance receives commits, attach a new EBS volume to the CI machin

Perform all setup on this EBS volume so you don\'t need a new EC2 instance to create the AMI.

Question 10

For AWS Auto Scaling, what is the first transition state an instance enters after leaving steady state when scaling in due to health check failure or decreased load?

Terminating

Detaching

Terminating:Wait

EnteringStandby

Question 11

What is the scope of an EBS snapshot?

Availability Zone

Placement Group

Region

VPC

Question 12

When thinking of AWS OpsWorks, which of the following is not an instance type you can allocate in a stack layer?

24/7 instances

Spot instances

Time-based instances

Load-based instances

Question 13

If I want CIoudFormation stack status updates to show up in a continuous delivery system in as close to real time as possible, how should I achieve this?

Use a long-poll on the Resources object in your CIoudFormation stack and display those state changesin the UI for the system.

Use a long-poll on the <code>ListStacks</code>API call for your CIoudFormation stack and display those state changes in the UI for the system.

Subscribe your continuous delivery system to an SNS topic that you also tell your CIoudFormation stack to publish events into.

Subscribe your continuous delivery system to an SQS queue that you also tell your CIoudFormation stack to publish events into.

Question 14

Your API requires the ability to stay online during AWS regional failures. Your API does not store any state, it only aggregates data from other sources - you do not have a database. What is a simple but effective way to achieve this uptime goal?

Use a CloudFront distribution to serve up your AP

Even if the region your API is in goes down, the edge locations CIoudFront uses will be fine.

Use an ELB and a cross-zone ELB deployment to create redundancy across datacenter

Even if a region fails, the other AZ will stay online.

Create a Route53 Weighted Round Robin record, and if one region goes down, have that region redirect to the other region.

Create a Route53 Latency Based Routing Record with Failover and point it to two identical deployments of your stateless API in two different region

Make sure both regions use Auto Scaling Groups behind ELBs.

Question 15

You are building a mobile app for consumers to post cat pictures online. You will be storing the images in AWS S3. You want to run the system very cheaply and simply. Which one of these options allows you to build a photo sharing application without needing to worry about scaling expensive uploads processes,
authentication/authorization and so forth?

Build the application out using AWS Cognito and web identity federation to allow users to log in using Facebook or Google Account

Once they are logged in, the secret token passed to that user is used to directly access resources on AWS, like AWS S3.

Use JWT or SANIL compliant systems to build authorization policie

Users log in with a username and password, and are given a token they can use indefinitely to make calls against the photo infrastructure.

Use AWS API Gateway with a constantly rotating API Key to allow access from the client-sid

Construct a custom build of the SDK and include S3 access in it.

Create an AWS oAuth Service Domain ad grant public signup and access to the domai

During setup, add at least one major social media site as a trusted Identity Provider for users.

Question 16

Which of the following tools does not directly support AWS OpsWorks, for monitoring your stacks?

AWS Config

Amazon CIoudWatch Nletrics

AWS CloudTraiI

Amazon CIoudWatch Logs

Question 17

You need to run a very large batch data processing job one time per day. The source data exists entirely in S3, and the output of the processing job should also be written to S3 when finished. If you need to version control this processing job and all setup and teardown logic for the system, what approach should you use?

Model an AWS EMR job in AWS Elastic Beanstalk.

Model an AWS EMR job in AWS CloudFormation.

Model an AWS EMR job in AWS OpsWorks.

Model an AWS EMR job in AWS CLI Compose

Question 18

What is server immutability?

Not updating a server after creation.

The ability to change server counts.

Updating a server after creation.

The inability to change server count

Question 19

Fill the blanks: helps us track AWS API calls and transitions, helps to understand what resources we have now, and allows auditing credentials and logins.

AWS Config, CIoudTraiI, IAM Credential Reports

CIoudTraiI, IAM Credential Reports, AWS Config

CIoudTraiI, AWS Config, IAM Credential Reports

AWS Config, IAM Credential Reports, CIoudTraiI

Question 20

Which of these is not an intrinsic function in AWS CIoudFormation?

Fn::SpIit

Fn::FindInMap

Fn::SeIect

Fn::GetAZs

Question 21

Why are more frequent snapshots or EBS Volumes faster?

Blocks in EBS Volumes are allocated lazily, since while logically separated from other EBS Volumes, Volumes often share the same physical hardwar

Snapshotting the first time forces full block range allocation, so the second snapshot doesn\'t need to perform the allocation phase and is faster.

The snapshots are incremental so that only the blocks on the device that have changed after your last snapshot are saved in the new snapshot.

AWS provisions more disk throughput for burst capacity during snapshots if the drive has been pre-warmed by snapshotting and reading all blocks.

The drive is pre-warmed, so block access is more rapid for volumes when every block on the device has already been read at least one time.

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Total 371 questions Full Exam Access