Question 1

What are the definitions for recovery point objective (RPO) and recovery time objective (RTO)?

RPO is the target time until recovery. RTO is the average amount of time to recover.
RPO is the maximum acceptable data loss, measured in bytes. RTO is the maximum acceptable data loss, measured in time.
RPO is the maximum acceptable data loss, measured in time. RTO is the maximum acceptable time until recovery.
RPO is the maximum acceptable data loss, measured in bytes. RTO is the average amount of time required to recover.

RPO answers the question: How often must your data be backed up? RTO answers the question: How quickly must your applications and data be recovered?

Question 2

What can you do to quickly replicate or redeploy environments in a disaster?

Use AWS Elastic Beanstalk to deploy a new virtual private cloud (VPC) and subnets in a different Region.
Use AWS CodeBuild to deploy application containers in a new virtual private cloud (VPC).
Use AWS CloudFormation templates to deploy duplicate environments in the same Region.
Use AWS OpsWorks to rebuild Amazon RDS instances.

AWS CloudFormation templates enable you to treat infrastructure as code. By using this method, you can standardize deployments. AWS CloudFormation StackSets enable you to create, update, or delete stacks across multiple accounts and Regions with a single operation.

Question 3

A company stores data in an Amazon S3 bucket. Which solution provides the most efficient way to ensure that all new and existing objects and metadata are copied to another Region for disaster recovery (DR)?

Create a workflow with AWS Step Functions and AWS Lambda to synchronize the buckets.
Copy existing objects to the target bucket, and configure clients to write new files to both buckets.
Enable cross-Region replication on the bucket and copy existing objects onto themselves.
Use an AWS Lambda function to copy objects so that all object create events initiate the function.

Cross-Region replication copies all new objects and overwrites of existing objects to a bucket in another Region and preserves the object metadata.

Question 4

Which strategy is the most efficient for Amazon EC2 disaster recovery (DR)?

Rebuild instances by using Amazon Machine Images (AMIs) from AWS Marketplace.
Back up instances on a regular schedule.
Synchronize instances with standby instances on nearly a continuous basis.
Store essential data separately from the instance, and develop rapid rebuild processes for compute instances.

Storing essential data separately from the instance, such as in Amazon Elastic Block Store (Amazon EBS) volumes and Amazon Elastic File System (Amazon EFS) file systems, is the most efficient strategy. It enables you to rebuild undifferentiated parts of instances from AMIs and code that is stored in repositories.

Question 5

Which service provides automatic failover between multiple endpoints in support of a geographic disaster recovery (DR) strategy?

Amazon Route 53
Elastic Load Balancing (ELB)
AWS Direct Connect
Amazon Virtual Private Cloud (Amazon VPC)

Question 6

Which statement about the backup and restore disaster recovery (DR) pattern is true?

Most cost-effective, but highest recovery time objective (RTO)
Most cost-effective, but highest recovery point objective (RPO)
Less cost effective, but lowest recovery point objective (RPO)
Less cost effective, but lowest recovery time objective (RTO)

This pattern is the most cost-effective because you primarily pay for data storage and do not pay to maintain running systems.

Question 7

Which statements accurately describe the infrastructure characteristics of common disaster recovery (DR) patterns? (Select TWO.)

Pilot light has minimal infrastructure that always runs. The rest of the infrastructure does not run until a disaster occurs.
Pilot light has a scaled-down version of all infrastructure that runs until a disaster occurs.
Warm standby has a second fully functional set of infrastructure that runs all the time.
Warm standby has a scaled-down version of all infrastructure that scales as necessary and within pre-defined limits to meet the load when a disaster occurs.
Pilot light runs with some infrastructure at full capacity. The rest scales up when a disaster occurs.

Pilot light has minimal infrastructure that runs all the time, and the rest of the infrastructure starts when a disaster occurs. Warm standby has a scaled-down version of all infrastructure that scales as necessary and within pre-defined limits to meet the load when a disaster occurs.

Question 8

What does the multi-site disaster recovery (DR) pattern involve?

It involves automatic failover to a second fully functional, constantly operational system that is in another site.
The load is distributed across multiple geographically separated sites to reduce the impact of disasters.
It involves failover to another site that is not running until it is needed.
Backups are stored in different sites so that they are protected if a disaster occurs.

Correct In AWS, you can implement this pattern with infrastructure in a second Region or virtual private cloud (VPC). You can also use infrastructure in AWS as a second site for your on-premises infrastructure.

Question 9

A company requires a disaster recovery (DR) solution for a business-critical application that provides a recovery time objective (RTO) and recovery point objective (RPO) in minutes. However, they do not want to pay for more than what they need. Which DR pattern would most likely meet these requirements?

Pilot light
Backup and restore
Multi-site
Warm standby

Warm standby can provide RTO and RPO in minutes. However, it comes with a tradeoff of higher cost compared to pilot light or backup and restore. It is less expensive than a multi-site approach.

Question 10

What does an AWS Storage Gateway enable you to do? (Select THREE.)

Present cloud-based internet Small Computer Systems Interface (iSCSI) block storage volumes to on-premises applications.
Transfer backup jobs from tape or Virtual Tape Library (VTL) systems to the cloud.
Connect to Amazon S3 through an API.
Give applications in a virtual private cloud (VPC) access to on-premises block storage volumes.
Use Server Message Block (SMB) or Network File System (NFS) to connect to Amazon S3.
Provide a fully managed elastic Network File System (NFS) endpoint to systems in a virtual private cloud (VPC) and on-premises.

Amazon S3 File Gateway offers SMB or NFS-based access to data in Amazon S3 with local caching. Volume Gateway presents cloud-based iSCSI block storage volumes to on-premises applications. AWS Storage Gateway can act as a VTL that is backed by Amazon S3.

CLD120 Module 16 Knowledge Check

Planning for Disaster

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