PAS-C01 Operations and Maintenance Practice Question
Exhibit
Refer to the exhibit.
ResourceRecordSet:
Type: AWS::Route53::RecordSet
Properties:
HostedZoneId: Z3AADJGX6KTTL2
Name: sap.example.com.
Type: CNAME
TTL: 60
ResourceRecords:
- sap-alb-1234567890.elb.amazonaws.comRefer to the exhibit. An SAP administrator has created this CloudFormation snippet to create a Route 53 record for an SAP system. The record is intended to point to an Application Load Balancer. What is a potential issue with this configuration?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using a CNAME record for the root domain (zone apex) is not allowed.
DNS standards prohibit using a CNAME record at the zone apex (root domain, e.g., example.com) because it would conflict with the SOA and NS records required for the zone. Route 53 does not allow CNAME records for the root domain. Option B is incorrect because a TTL of 60 seconds is acceptable for dynamic environments. Option C is incorrect because an ALB endpoint is a DNS name, not an IP address, so an A record cannot be used; Route 53 supports alias records for ALBs, but the snippet uses a CNAME. Option D is incorrect because the ResourceRecords value for a CNAME record must be a DNS name, not an IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Using a CNAME record for the root domain (zone apex) is not allowed.
Why this is correct
DNS standards prohibit CNAME at the zone apex; an Alias record should be used instead.
- ✗
The TTL value of 60 seconds is too low for production use.
Why it's wrong here
A TTL of 60 seconds is acceptable for dynamic environments.
- ✗
The RecordSet type should be A instead of CNAME for an ALB.
Why it's wrong here
ALB endpoints are DNS names, so CNAME is appropriate.
- ✗
The ResourceRecords value should be an IP address, not a DNS name.
Why it's wrong here
CNAME records can point to other DNS names.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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