The answer is Amazon Route 53. This is the correct choice because Route 53 is the only AWS DNS service that natively combines domain name resolution with health checks and automated failover; it translates domain names into IP addresses, monitors the health of your web servers via configurable health checks, and uses routing policies like failover to automatically redirect traffic to a healthy backup server when the primary fails. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of core networking services, and a common trap is confusing Route 53 with Elastic Load Balancing—remember that ELB handles traffic distribution within a region, while Route 53 handles global DNS-based failover across regions. A simple memory tip: think of Route 53 as the "traffic cop" that not only looks up addresses but also checks if the destination is alive and reroutes cars to a backup road if the main one is blocked.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their web servers, and automatically redirect traffic to a healthy backup server if the primary server fails. Which AWS service provides all of these capabilities?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Why wrong: VPC provides network isolation but does not perform DNS resolution, health checking, or traffic failover routing.
B
Amazon CloudFront
Why wrong: CloudFront is a CDN that caches and delivers content. It does not perform DNS resolution or health-based failover routing for backend servers.
C
Amazon Route 53
Route 53 is AWS's DNS service. It translates domain names to IP addresses, performs health checks on endpoints, and supports failover routing policies that redirect traffic to a healthy resource when the primary fails.
D
AWS Direct Connect
Why wrong: Direct Connect provides dedicated network connectivity between on-premises and AWS. It does not provide DNS, health checking, or traffic routing capabilities.
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
Amazon Route 53 is a DNS web service that translates domain names to IP addresses. It also offers health checks that monitor the availability of web servers and can automatically route traffic away from unhealthy endpoints to healthy ones using DNS failover routing policies.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 VPC
Why it's wrong here
VPC provides network isolation but does not perform DNS resolution, health checking, or traffic failover routing.
✗
Amazon CloudFront
Why it's wrong here
CloudFront is a CDN that caches and delivers content. It does not perform DNS resolution or health-based failover routing for backend servers.
✓
Amazon Route 53
Why this is correct
Route 53 is AWS's DNS service. It translates domain names to IP addresses, performs health checks on endpoints, and supports failover routing policies that redirect traffic to a healthy resource when the primary fails.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Direct Connect
Why it's wrong here
Direct Connect provides dedicated network connectivity between on-premises and AWS. It does not provide DNS, health checking, or traffic routing capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse CloudFront's edge caching and origin failover (which only works for specific HTTP errors) with Route 53's DNS-level health checks and failover, which operate at the network layer and can redirect traffic before it even reaches the web server.
Detailed technical explanation
How to think about this question
Route 53's DNS failover works by associating health checks with DNS records; if a health check fails, Route 53 removes the failed resource from DNS responses and returns only healthy IPs. This leverages DNS TTL values (commonly 60–300 seconds) to control how quickly clients receive updated routing information. In a real-world scenario, a multi-region web application can use Route 53 latency-based routing combined with health checks to automatically shift user traffic to a healthy region if the primary region's servers become unresponsive.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon Route 53 — Amazon Route 53 is a DNS web service that translates domain names to IP addresses. It also offers health checks that monitor the availability of web servers and can automatically route traffic away from unhealthy endpoints to healthy ones using DNS failover routing policies.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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