每天半小时搞定 AoAWS (二十一)

Architecting on AWS 学习笔记系列文章导航页面

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68.A company has a requirement for archival of 6TB of data.There is an agreement with the stakeholders for an 8-hour agreed retrieval time. Which of the following can be used as the MOST cost-effective storage option?
A. AWS S3 Standard
B. AWS S3 Infrequent Access
C. AWS Glacier
D. AWS EBS Volumes

Note:
Amazon Glacier is the perfect solution for this. Since the agreed time frame for retrieval is met at 8 hours, this will be the most cost effective option. For more information on AWS Glacier, please visit the following URL:(https://aws.amazon.com/documentation/glacier/)

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69.A company hosts 5 web servers in AWS.They want to ensure that Route53 can be used to route user traffic to random web servers when they request for the underlying web application. Which routing policy should be used to fulfill this requirement?
A. Simple
B. Weighted
C. Multivalue Answer
D. Latency

Note:
在AWS Route53中有多种不同的路由策略（Routing Policy），我们可以根据自己的不同需求将我们的DNS解析到不同的目标上去。

• 简单路由策略（Simple Routing Policy）：提供单一资源的策略类型，即一个DNS域名指向一个单一目标
• 加权路由策略（Weighted Rouing Policy）：按照不同的权值比例将流量分配到不同的目标上去
• 延迟路由策略（Latency Routing Policy）：根据网络延迟的不同，将与用户延迟最小的结果应答给最终用户
• 地理位置路由策略（Geolocation Routing Policy）：根据用户所在的地理位置，将不同的目标结果应答给用户
• 故障转移路由策略（Failover Routing Policy）：配置主动/被动（Active/Passive）的故障转移策略，保证DNS解析的容灾

多值应答路由不能替代 Elastic Load Balancing (ELB)
https://aws.amazon.com/cn/premiumsupport/knowledge-center/multivalue-versus-simple-policies/?nc1=h_ls

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70.A company has a requirement for a managed database in AWS. It is also required that joins need to be performed on the underlying queries. Which of the following can be used as the underlying database?
A. AWS Aurora
B. AWS DynamoDB (noSQL)
C. AWS S3
D. AWS Redshift (data warehouse)

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