Module 14: Planning for Disaster Flashcards
What are Recovery Point Objective (RPO) and Recovery Time Objective (RTO)?
- RPO is the maximum acceptable data loss, measured in bytes. RTO is the average amount of time required to recover.
- 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 maximum acceptable data loss, measured in time.
- 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 time. - RTO is the maximum acceptable time until recovery.
(RPO answers the question: How often must your data be backed up? RTO answers the question: How quickly must yoru applications and data be recovered?
What can you do to quickly replicate or redeploy environments in a disaster?
- Use AWS CodeBuild to deploy application containers in a new virtual private cloud (VPC).
- Use AWS OpsWorks to rebuild Amazon Relational Database Service (Amazon RDS) instances.
- Use AWS CloudFormation templates to deploy duplicate environments in the same Region.
- Use AWS Elastic Beanstalk to deploy a new virtual private cloud (VPC) and subnets ina different Region.
- Use AWS CloudFormation templates to deploy duplicate environments in the same Region.
(AWS CloudFormation templates enable you to treat infrastructure as code. By using this method, youcan standardize deployments. AWS CloudFormation StackSets enable you to create, update, or delete stacks across multiple accounts and Regions with a single operation.)
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 recover (DR)?
- 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 trigger the function.
- 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.
(Cross-region replication copies all new objects and overwrites of existing objects to a bucket in another Region, and preserves the object metadata.)
- What strategy is the most efficient for Amazon EC2 disaster recovery (DR)?
- Back up instances on a regular schedule.
- Store essential data off the instance and develop rapid rebuild processes for compute instances.
- Synchronize instances with standby instances on nearly a continuous basis.
- Rebuild instances by using Amazon Machine Images (AMIs) from the AWS Marketplace
The correct answer is not:
“ - Synchronize instances with standby instances on nearly a continuous basis. “ (This approach requires a running duplicate standby instance for each primary instance. The synchronization activity and running times of the standby instances make this strategy a less-efficient solution.)
or
“Back up instances on a regular schedule”
(Backing up undifferentiated data (such as the operating system) from multiple instances wastes storage for backups. A better approach is to configure automatic rebuilds from AMIs, Amazon EBS snapshots, and code that is stored in a repository.)
Which service provides automatic failover between multiple endpoints in support of a geographic disaster recovery (DR) strategy?
- Amazon Virtual Private Cloud (VPC)
- AWS Direct Connect
- Elastic Load Balancing
- Amazon Route 53
- Amazon Route 53
( You can configure Route 53 to fail over between multiple endpoints in different Regions.)
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 Pont Objective (RPO)
- Lowest Recovery Time Objective (RTO), but least cost-effective
- Lowest Recovery Point Objective (RPO), but least cost-effective
- Most cost-effective, but highest 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. It has the highest RTO.)
What is the difference between the pilot light and warm standby disaster recovery (DR) patterns? (Select TWO.)
- Pilot light has a scaled-down version of all infrastructure that runs until a disaster occurs.
- Warm standby 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 of the time.
- Pilot light has a minimal infrastructure that always runs. The rest does not run until a disaster occurs.
- With warm standby, all infrastructure runs in sleep mode and is awakened when a disaster occurs.
- Warm standby has a scaled-down version of all infrastructure that runs until a disaster occurs.
- Pilot light has a minimal infrastructure that always runs. The rest does not run until a disaster occurs.
(Pilot light has a minimal infrastructure that runs all the time, and the rest starts when a disaster occurs. Warm standby has a full set of scaled-down infrastructure that runs all the time, and the infrastructure scales up when a disaster occurs.)
What does the multi-site disaster recovery (DR) pattern involve?
- 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.
- Backups are stored in different sites so that they are protected if a disaster occurs.
- Failover to another site that is not running until it is needed.
The following answer is not correct:
“- The load is distributed across multiple geographically separated sites to reduce the impact of disasters.”
(This strategy is not DR. It is fault isolation)
- or -
“- Backups are stored in different sites so that they are protected if a disaster occurs.”
(This strategy is typically part of the backup and restore pattern.)
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?
- Backup and restore
- Pilot light
- Warm standby
- Multi-site
- Warm standby
(Warm standby is most likely to 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 lesl expensive than a multi-site approach.)
What does AWS Storage Gateway enable you to do? (Select THREE.)
- Use Server Message Blcok (SMB) or Network Files System (NFS) to connect to Amazon S3
- Give applications in a virtual private cloud access to on-premises block storage volumes
- Transfer backup jobs from tape or Virtual Tape Library (VTL) systems to the cloud
- Connect to Amazon S3 through an API
- Present cloud-based intenet Small Computer Systems Interface (iSCSI) storage volumes to on-premises applications.
The answer is not the following combination:
( “- Use Server Message Block (SMB) or Network Files System (NFS) to connect to Amazon S3
- Transfer backup jobs from tape or Virtual Tape Library (VTL) systems to the cloud
- Connect to Amazon S3 through an API”
(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 Virtual Tape Library (VTL) that is backed by Amazon S3.)
