ANS-C01 · Question #85
ANS-C01 Question #85: Real Exam Question with Answer & Explanation
The correct answer is B: Create a staging example.com NS record in the example.com domain. Populate the value with. When a client queries a DNS server for a domain name, the DNS server typically starts by looking for NS records to determine which name servers are authoritative for the domain. The DNS server then queries the authoritative name servers to obtain the information about the domain
Question
A development team is building a new web application in the AWS Cloud. The main company domain, example.com, is currently hosted in an Amazon Route 53 public hosted zone in one of the company's production AWS accounts. The developers want to test the web application in the company's staging AWS account by using publicly resolvable subdomains under the example.com domain with the ability to create and delete DNS records as needed. Developers have full access to Route 53 hosted zones within the staging account, but they are prohibited from accessing resources in any of the production AWS accounts. Which combination of steps should a network engineer take to allow the developers to create records under the example com domain? (Choose two.)
Options
- ACreate a public hosted zone for example com in the staging account
- BCreate a staging example.com NS record in the example.com domain. Populate the value with
- CCreate a private hosted zone for staging example com in the staging account.
- DCreate an example com NS record in the staging example.com domain. Populate the value with
- ECreate a public hosted zone for staging.example.com in the staging account.
Explanation
When a client queries a DNS server for a domain name, the DNS server typically starts by looking for NS records to determine which name servers are authoritative for the domain. The DNS server then queries the authoritative name servers to obtain the information about the domain that the client requested. For example, suppose you own the domain example.com, but you want to delegate control of the subdomain sub.example.com to a different set of name servers. You would create NS records in the example.com zone file that point to the name servers for sub.example.com. This tells DNS servers that the name servers for sub.example.com are authoritative for that subdomain, and they should query those name servers for any requests related to sub.example.com.
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