每天半小时搞定 AoAWS (六)_aws expedited retrieval-优快云博客

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23.A company is to run a service on AWS to provide offsite backups for images on laptops and phones.
The solution must support millions of customers with thousands of images per customer. Though the images will be retrieved infrequently, they must be available for retrieval immediately. Which is the MOST cost efficient storage option that meets these requirements?
A. Amazon Glacier with Expedited retrievals
B. Amazon S3 Standard Infrequent Access
C. Amazon EFS
D. Amazon S3 Standard

Note:
Amazon S3 Infrequent Access is perfect if you want to store data that need not be frequently accessed. It is must more cost effective than Amazon S3 Standard. For more information on AWS Storage classes, please visit the following URL: (https://aws.amazon.com/cn/s3/storage-classes/)
if you choose Amazon Glacier with expedited retrievals, then you defeat the whole purpose of the requirement, because you would have an increased cost with this option

24.A Solutions Architect designing a solution to store and archive corporate documents, has determined Amazon Glacier as the right choice of solution.
An important requirement is that the data must be delivered within 10 minutes of a retrieval request. Which feature in Amazon Glacier can help meet this requirement?
A. Vault Lock
B. Expedited retrieval
C. Bulk retrieval
D. Standard retrieval

Note:
Amazon S3 Glacier存储类为适应您的使用案例，提供了三种检索选项。加急检索通常可在1至5分钟内返回数据，非常适用于Acrive Archive使用案例。标准检索完成工作通常需要3到5小时，非常适用于时效性较低的需求，如备份数据、媒体编辑或者长期分析。批量检索是成本最低的选项，可在5至12小时内返回大量数据. Amazon S3 Glacier Deep Archive存储类提供两种检索选项，检索时间可以从12小时到48小时不等。更多详情参见：(https://aws.amazon.com/cn/glacier/)

25.Data processing application in AWS must pull data from an Internet service.
A Solutions Architect is to design a highly available solution to access this data without placing bandwidth constraints on the application traffic. Which solution meets these requirements?
A. Launch a NAT gateway and add routes for 0.0.0.0/0
B. Attach a VPC endpoint and add routes for 0.0.0.0/0
C. Attach an Internet gateway and add routes for 0.0.0.0/0
D. Deploy NAT instances in a public subnet and add routes for 0.0.0.0/0

Note:
An Internet gateway is a horizontally scaled, redundant, and highly available VPC component that allows communication between instances in your VPC and the Internet. It therefore imposes no availability risks or bandwidth constraints on your network traffic. An internet gateway serves two purposes: to provide a target in your VPC route tables for internet-routable traffic, and to perform network address translation (NAT) for instances that have been assigned public IPv4 addresses. For more information on the Internet gateway, please visit the following URL: (https://docs.aws.amazon.com/zh_cn/vpc/latest/userguide/VPC_Internet_Gateway.html)
NAT gateway is also a highly available architecture and is used to enable instances in a private subnet to connect to the internet or other AWS services, but prevent the internet from initiating a connection with those instances. It can only scale up to 45 Gbps. NAT instances bandwidth capability depends upon the instance type. (https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html)

VPC Endpoints are used to enable private connectivity to services hosted in AWS, from within your VPC without using an Internet Gateway, VPN, Network Address Translation (NAT) devices, or firewall proxies. So it cannot be used to connect to internet.