- A
Amazon Route 53 geolocation routing policy
Why wrong: Geolocation is for location-based routing, not latency.
- B
Amazon Route 53 failover routing policy
Why wrong: Failover routing is for primary/secondary, not latency-based.
- C
Amazon Route 53 weighted routing policy for each ALB endpoint
Weighted records allow manual traffic shifting for maintenance.
- D
Amazon Route 53 latency-based routing policy
Latency routing sends traffic to the lowest-latency healthy Region.
- E
Amazon Route 53 health checks for each ALB endpoint
Health checks automatically remove unhealthy Regions.
Question 1,353 of 1,705
ANS-C01 Latency-based routing Practice Question
This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: latency-based routing. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is designing a network architecture for a critical application that must be highly available across AWS Regions. The application uses an Application Load Balancer (ALB) in each Region, and the company wants to use a global DNS name that automatically routes traffic to the healthy Region with the lowest latency. The company also needs to be able to perform planned failover for maintenance. Which THREE components are required to meet these requirements?
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
✓
Amazon Route 53 weighted routing policy for each ALB endpoint
The correct components are a latency-based routing policy to automatically route to the lowest latency healthy region, health checks to determine endpoint health, and a weighted routing policy to enable planned failover by adjusting weights. While latency and weighted routing policies cannot be used simultaneously on the same record set, the question tests the knowledge of the required policies: latency for automatic routing, health checks for failover, and weighted for manual traffic shifting during maintenance. In practice, you would implement latency-based routing with health checks, and for planned maintenance, you would temporarily change the routing policy to weighted or use a separate record.
Key principle: Latency-based routing
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Route 53 geolocation routing policy
Why it's wrong here
Geolocation is for location-based routing, not latency.
- ✗
Amazon Route 53 failover routing policy
Why it's wrong here
Failover routing is for primary/secondary, not latency-based.
- ✓
Amazon Route 53 weighted routing policy for each ALB endpoint
Why this is correct
Weighted records allow manual traffic shifting for maintenance.
Related concept
Latency-based routing
- ✓
Amazon Route 53 latency-based routing policy
Why this is correct
Latency routing sends traffic to the lowest-latency healthy Region.
Related concept
Latency-based routing
- ✓
Amazon Route 53 health checks for each ALB endpoint
Why this is correct
Health checks automatically remove unhealthy Regions.
Related concept
Latency-based routing
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that you can combine multiple routing policies (like latency and weighted) on the same Route 53 record set, but in reality, you cannot. The correct architecture uses latency-based routing with health checks for automatic failover, and a separate weighted routing policy (or a routing policy change) for planned failover.
Detailed technical explanation
How to think about this question
Latency-based routing uses DNS resolution to direct users to the endpoint that provides the lowest latency based on AWS edge locations and Region measurements, but it does not inherently support planned failover. By combining weighted routing (with weights that can be adjusted to 0 for maintenance) and health checks (which mark unhealthy endpoints as 'unhealthy' and remove them from DNS responses), you achieve both automatic health-based failover and manual control for maintenance. The health check must be configured to monitor the ALB endpoint (e.g., via HTTP/HTTPS on a specific path) and must be associated with the latency-based alias record to enable DNS failover.
KKey Concepts to Remember
- Latency-based routing
- Health checks
- Weighted routing
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Latency-based routing
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
Got this wrong? Here's your next step.
Review latency-based routing, then practise related ANS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Latency-based routing.
What is the correct answer to this question?
The correct answer is: Amazon Route 53 weighted routing policy for each ALB endpoint — The correct components are a latency-based routing policy to automatically route to the lowest latency healthy region, health checks to determine endpoint health, and a weighted routing policy to enable planned failover by adjusting weights. While latency and weighted routing policies cannot be used simultaneously on the same record set, the question tests the knowledge of the required policies: latency for automatic routing, health checks for failover, and weighted for manual traffic shifting during maintenance. In practice, you would implement latency-based routing with health checks, and for planned maintenance, you would temporarily change the routing policy to weighted or use a separate record.
What should I do if I get this ANS-C01 question wrong?
Review latency-based routing, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Latency-based routing
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Last reviewed: Jul 4, 2026
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