每天半小时搞定 AoAWS (十八)

Architecting on AWS 学习笔记系列文章导航页面

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59.There is a website hosted in AWS that might get a lot of traffic over the next couple of weeks.
If the application experiences a natural disaster in the future, which of the following can be used to reduce potential disruption to users?
A. Use an ELB to divert traffic to an Infrastructure hosted in another region.
B. Use an ELB to divert traffic to an Infrastructure hosted in another AZ.
C. Use CloudFormation to create backup resources in another AZ.
*D. Use Route53 to route to a static web site. *

Note:
Due to the natural disaster maybe effect all the region that the website located, so only divert traffic to another AZ in the same region is inavailable!

The ELB mostly used betwwen AZs in the same VPC!

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60.You have a requirement to host a static website for a domain called mycompany.com in AWS.
It is required to ensure that the traffic is scaled properly. How can this be achieved? Choose 2 answers from the options given below.
A. Host the static site on an EC2 Instance.
B. Use Route53 with static web site in S3.
C. Enter the NS records from Route53 in the domain registrar.
D. Place the EC2 instance behind the ELB.

Note:
Note the key words – host a static website for a domain, the solution should be at domain level, so we must use the DNS dispatcher Route53.

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61.A database hosted using the AWS RDS service is getting a lot of database queries and has now become a bottleneck for the associating application.
What action will ensure that the database is not a performance bottleneck?
A. Setup a CloudFront distribution in front of the database.
B. Setup an ELB in front of the database.
C. Setup ElastiCache in front of the database.
D. Setup SNS in front of the database.

Note:
ElastiCache is an in-memory solution(Redis or MemoryCache) which can be used in front of a database to cache the common queries issued against the database. This can reduce the overall load on the database. For more information on ElastiCache, please visit the following URL: (https://aws.amazon.com/elasticache/)

Option A is incorrect because this is normally used for content distribution.

Option B is partially correct, but you need to have one more database as an internal load balancing solution.

Option D is incorrect because SNS is a simple notification service.

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