AWS Certified SysOps Administrator – Associate — Question 51

A company’s SysOps administrator deploys a public Network Load Balancer (NLB) in front of the company’s web application. The web application does not use any Elastic IP addresses. Users must access the web application by using the company’s domain name. The SysOps administrator needs to configure Amazon Route 53 to route traffic to the NLB.

Which solution will meet these requirements MOST cost-effectively?

Answer options

• A. Create a Route 53 AAAA record for the NLB.
• B. Create a Route 53 alias record for the NLB.
• C. Create a Route 53 CAA record for the NLB.
• D. Create a Route 53 CNAME record for the NLB.

Correct answer: B

Explanation

The correct answer is B, as using a Route 53 alias record allows direct routing to the NLB without additional costs associated with CNAME records, which incur DNS query charges. Option A is incorrect because AAAA records are used for IPv6 addresses, and the NLB does not use Elastic IPs. Option C is irrelevant as CAA records are for certificate authority authorization, not for routing traffic. Option D is less cost-effective because CNAME records can lead to added charges and do not support root domain names directly.