Q55 — AWS SOA-C02 Ch.1

Question 55 of 100 | ← Chapter 1

A company hosts its website on Amazon EC2 instances behind an Application Load Balancer. The company manages its DNS with Amazon Route 53, and wants to point its domain's zone apex to the website. Which type of record should be used to meet these requirements?

• A. An AAAA record for the domain's zone apex
• B. An A record for the domain's zone apex
• C. A CNAME record for the domain's zone apex
• D. An alias record for the domain's zone apex ✓

Correct Answer: D. An alias record for the domain's zone apex

Explanation

题目核心在于Route 53中域名的zone apex（根域名）指向负载均衡器的场景。根据DNS规范，CNAME记录不能用于根域名，而A记录需固定IP地址，但负载均衡器IP会动态变化。AWS提供的Alias记录专为此类场景设计，可直接关联ALB的DNS名称并动态解析其IP，实现根域名的稳定映射，无需手动维护。其他选项因协议限制或功能不符均不适用。