PAS-C01 Operations and Maintenance Practice Question
A company is running SAP on AWS and wants to ensure high availability for the SAP Central Services (ASCS) instance. They have set up a cluster using Amazon Route 53 with health checks. During a failover test, the ASCS instance fails but the DNS record does not update immediately. What is the most likely cause?
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
✓
The TTL on the DNS record is set too high
The TTL (Time to Live) on the DNS record determines how long clients cache the DNS response. If the TTL is set too high, clients continue to use the old (failed) IP address even after Route 53 updates the record based on the health check. This delays failover. Options B and C are incorrect because health checks and routing policies do affect failover, but the immediate cause of the delay is the TTL. Option D is incorrect because Route 53 record sets are updatable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The TTL on the DNS record is set too high
Why this is correct
High TTL causes clients to cache old IPs, delaying failover.
- ✗
The health check is not configured to check the ASCS service port
Why it's wrong here
Health check configuration affects detection but not propagation delay.
- ✗
The Route 53 record is using simple routing instead of failover
Why it's wrong here
Routing policy affects behavior but not TTL-related delay.
- ✗
The Route 53 record set is not updatable
Why it's wrong here
Route 53 records can be updated at any time.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.