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CV0-004 Practice Question: A multinational corporation is deploying a new…
A multinational corporation is deploying a new application across multiple cloud regions for disaster recovery. The application requires consistent low latency for users globally. The architect decides to use a content delivery network (CDN) for static assets and a global load balancer for API traffic. After deployment, some users in Asia report occasional timeouts when accessing the API. The API servers are deployed in the US East and Europe regions. The load balancer is configured with latency-based routing. What is the most likely cause of the timeouts?
⚠ Common exam trap
The trap here is that candidates often overlook DNS caching behavior and instead focus on load balancer configuration or server capacity, failing to recognize that high DNS TTL can cause stale routing decisions in latency-based architectures.
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 DNS TTL is set too high, causing cached resolution to a failed server.
A high DNS TTL causes clients to cache the IP address of a failed or unhealthy API server for an extended period. When that server becomes unavailable, clients continue to send requests to the cached IP instead of querying DNS for a healthy endpoint, resulting in timeouts. This is a common issue with latency-based routing, where DNS resolution is critical for directing traffic to the optimal region.
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 latency-based routing is directing traffic to the farthest region due to routing table issues.
Why it's wrong here
Latency-based routing generally works correctly; routing issues would cause more widespread problems.
- ✗
The API servers in Europe have insufficient capacity.
Why it's wrong here
Capacity issues would cause consistent errors, not occasional timeouts.
- ✗
The CDN is misconfigured for the API endpoints.
Why it's wrong here
CDN typically serves static content, not dynamic API calls.
- ✓
The DNS TTL is set too high, causing cached resolution to a failed server.
Why this is correct
High TTL means clients cache DNS results; if a server fails, they still try that IP until cache expires, causing timeouts.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.