Architecting on AWS 学习笔记系列文章导航页面

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56.There is a requirement for an iSCSI device and the legacy application needs local storage.
Which of the following can be used to meet the demands of the application?
A. Configure the Simple Storage Service.
B. Configure Storage Gateway Cached volume.
C. Configure Storage Gateway Stored volume.
D. Configure Amazon Glacier.

Note:
If you need low-latency access to your entire dataset, first configure your on-premises gateway to store all your data locally. Then, asynchronously back up point-in-time snapshots of this data to Amazon S3. This configuration provides durable and inexpensive offsite backups that you can recover to your local data center or Amazon EC2. For example, if you need replacement capacity for disaster recovery, you can recover the backups to Amazon EC2. For more information on the Storage gateway, please visit the following URL: (https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html)

S3 and Glacier are not used for this purpose.

Volume gateway provides an iSCSI target, which enables you to create volumes and mount them as iSCSI devices from your on-premises or EC2 application servers. <>font color=blueThe volume gateway runs in either a cached or stored mode. In the cached mode, your primary data is written to S3, while retaining your frequently accessed data locally in a cache for low-latency access. In the stored mode, your primary data is stored locally and your entire dataset is available for low-latency access while asynchronously backed up to AWS.

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57.There is a requirement for EC2 Instances in a private subnet to access an S3 bucket.
It is required that the traffic does not traverse to the Internet. Which of the following can be used to fulfill this requirement?
A. VPC Endpoint
B. NAT Instance
C. NAT Gateway
D. Internet Gateway

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58.There is an application which consists of EC2 Instances behind a classic ELB.
An EC2 proxy is used for content management to backend instances. The application might not be able to scale properly.
Which of the following can be used to scale the proxy and backend instances appropriately?
Choose 2 answers from the options given below.
A. Use Auto Scaling for the proxy servers.
B. Use Auto Scaling for the backend instances.
C. Replace the Classic ELB with Application ELB.
D. Use Application ELB for both the front end and backend instances.

Note:
When you see a requirement for scaling, consider the Auto Scaling service provided by AWS. This can be used to scale both proxy servers and backend instances. For more information on Auto Scaling, please visit the following URL: (https://docs.aws.amazon.com/autoscaling/plans/userguide/what-is-aws-auto-scaling.html)

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