Exam ANS-C00 topic 1 question 173 discussion

Exam question from Amazon's ANS-C00

Question #: 173
Topic #: 1

You have a server that serves www, FTP, and mail. You need to access this server using www.yourname.com, ftp.yourname.com, and mail.yourname.com. You want to ensure an IP change results in the least number of other changes.
What is the best solution?

A. Create PTR records and point the IP address of the server back to www, ftp, and mail.
B. Create an A record pointing to the server's IP address and create CNAME records for www, ftp, and mail and point those to the A record.
C. Create an A record for www, ftp and mail, and point it to the ALIAS of the server.
D. Create CNAME records for www, ftp, and mail and point those to the A record already provided to the instance by AWS.

Show Suggested Answer

Suggested Answer: B 🗳️
There is no ALIAS record for an EC2 instance, CNAME records pointed to the A record provided by AWS won't work because if the IP changes, the A record will change also. A PTR record is not appropriate here and cannot point to more than one record. Having three CNAME records and one A record will result in only having to change the A record if the IP changes.

by eeghai7thioyaiR4 at March 16, 2021, 2:24 p.m.

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Comments

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ChauPhan

Highly Voted 3 years, 7 months ago

A. No, DTR record is not used in this case. D. No, there is no such A record provided by AWS C. There is no alias for instances, only some services such as S3, ELB ==> B

upvoted 5 times

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eeghai7thioyaiR4

Most Recent 3 years, 8 months ago

The D would be fine

upvoted 2 times

eeghai7thioyaiR4

3 years, 7 months ago

I correct myself again: B is the right answer When you change an IP from an ec2 instance, the public DNS name of the instance will change, so you'll need to change 3 records (www, ftp and mail will need to point to the new name). So D is wrong With B, you only change one record

upvoted 11 times

sapien45

3 years, 2 months ago

Thank you for the clear explanations

upvoted 1 times

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