This KCNA practice question tests your understanding of container orchestration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An application running in a Kubernetes pod needs to access a database that is deployed on a VM outside the cluster. The database IP is stable. Which is the best way to expose the database to the pod?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Service of type ExternalName pointing to the database hostname
Option B is correct because a Service of type ExternalName provides a DNS-based abstraction for external resources, mapping a Kubernetes service name to an external DNS name (the database hostname). This allows the pod to access the database via a stable in-cluster DNS name without needing to manage IP changes or network policies for external endpoints. It is the simplest and most Kubernetes-native way to expose a stable external IP to a pod.
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.
✗
Expose the database via Ingress
Why it's wrong here
Ingress is for HTTP/HTTPS traffic, not TCP for databases.
✓
Create a Service of type ExternalName pointing to the database hostname
Why this is correct
ExternalName service provides a DNS alias to an external resource.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a Headless Service
Why it's wrong here
Headless services are for discovering pods, not external services.
✗
Create an EndpointSlice manually with the pod IP
Why it's wrong here
EndpointSlice is used for internal endpoints, not external IPs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Ingress can handle any external service, but Ingress is strictly for HTTP/HTTPS traffic and cannot expose raw TCP services like databases.
Detailed technical explanation
How to think about this question
An ExternalName Service works by creating a CNAME record in the cluster's DNS (CoreDNS) that resolves to the external hostname, so the pod's DNS query for the service name returns the external IP directly. This avoids the need for a ClusterIP or kube-proxy routing, making it lightweight and ideal for stable external endpoints. In real-world scenarios, this is commonly used to integrate legacy databases or SaaS services without modifying application code.
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
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Service of type ExternalName pointing to the database hostname — Option B is correct because a Service of type ExternalName provides a DNS-based abstraction for external resources, mapping a Kubernetes service name to an external DNS name (the database hostname). This allows the pod to access the database via a stable in-cluster DNS name without needing to manage IP changes or network policies for external endpoints. It is the simplest and most Kubernetes-native way to expose a stable external IP to a pod.
What should I do if I get this KCNA 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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