Explanation:
Option C is correct because an A record is necessary to map mydomain.com to the load balancer's IPv4 address. CNAME records are then used to alias home.mydomain.com and http://www.mydomain.com to mydomain.com, ensuring all domains resolve to the same IP address. Options A and B are incorrect due to the misuse of A and AAAA records for subdomains, and option D is incorrect because NS records are not used for IP address mapping but for DNS delegation. For more details, refer to Google Cloud DNS documentation.
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You have developed an application utilizing Compute Engine instances behind a load balancer on Google Cloud. How would you configure Cloud DNS so that home.mydomain.com, mydomain.com, and http://www.mydomain.com all direct to your load balancer's IP address?
A
Create one CNAME record to point mydomain.com to the load balancer, then establish two A records to direct WWW and HOME to mydomain.com.
B
Set up one CNAME record for mydomain.com to the load balancer, and two AAAA records to point WWW and HOME to mydomain.com.
C
Use one A record to link mydomain.com to the load balancer's IP, and create two CNAME records for WWW and HOME to alias to mydomain.com.
D
Link mydomain.com to the load balancer with one A record, and generate two NS records to delegate WWW and HOME to mydomain.com.
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