A company runs a web application that users access using the name www example com. The company manages the domain name example.com using Amazon Route 53. The company created an Amazon CloudFront distribution in front of the application and would like www.example.com to access the application through CloudFront.
What is the MOST cost-effective way to achieve this?
To access the web application through CloudFront using www.example.com, the most cost-effective way is to create an ALIAS record in Amazon Route 53 that points to the CloudFront distribution URL. ALIAS records are designed specifically for mapping domain names to AWS resources, including CloudFront distributions, and they do not incur additional DNS query charges, which makes them more cost-effective compared to CNAME records.
Option B is the correct answer because ALIAS records in Amazon Route 53 are used to map domain names directly to AWS resources like CloudFront distributions, S3 buckets, Elastic Load Balancers, and more. ALIAS records provide a more efficient and cost-effective way to route traffic to these AWS resources compared to CNAME records.
apex zone= ALias
B is the correct answer
Answer is B - this is a very similar question that other practice test from Udemy offer
Answer is A. CNAME – maps a hostname to another hostname. Example: you can’t create for example.com, but you can create for www.example.com
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www.example.com -- alias -- example.com
Answer is A, it is TRUE that apex maps only to alias… HOWEVER in this question you are mapping www subdomain to cname of the url of cloudfront… WWW is not APEX… https://repost.aws/questions/QUISgcF7I1Q9K4jzyReQiDMA/cname-for-domain-com-without-www
after more research, answer is B since it is more cost effective to create an alias (which is free) WWW that points to Cloudfront distribution URL.