- A
ConfigMap
Why wrong: A ConfigMap stores non-sensitive configuration data, not network endpoints.
- B
Namespace
Why wrong: A Namespace provides resource isolation, not network stability.
- C
Service
A Service provides a stable IP and DNS name for a set of pods, abstracting pod IP changes.
- D
Deployment
Why wrong: A Deployment manages pod replicas and updates, but does not provide a stable network endpoint.
Question 508 of 1,000
200-901 Application Deployment and Security Practice Question
This 200-901 practice question tests your understanding of application deployment and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In a Kubernetes cluster, a developer needs to ensure that a set of pods can be accessed by other pods using a stable IP address and DNS name, even if pods are recreated. Which resource should be created?
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
✓
Service
A Service in Kubernetes provides a stable virtual IP (ClusterIP) and a DNS name (via CoreDNS) that persists across pod restarts and rescheduling. This allows other pods to reliably discover and communicate with the set of pods behind the Service, regardless of individual pod IP changes.
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.
- ✗
ConfigMap
Why it's wrong here
A ConfigMap stores non-sensitive configuration data, not network endpoints.
- ✗
Namespace
Why it's wrong here
A Namespace provides resource isolation, not network stability.
- ✓
Service
Why this is correct
A Service provides a stable IP and DNS name for a set of pods, abstracting pod IP changes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deployment
Why it's wrong here
A Deployment manages pod replicas and updates, but does not provide a stable network endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a Deployment alone provides stable networking, but a Deployment only ensures desired pod count and updates, not a fixed network identity — the Service resource is required for that.
Detailed technical explanation
How to think about this question
A Service of type ClusterIP (default) is backed by iptables or IPVS rules on each node that load-balance traffic to the pod endpoints. The DNS name follows the format <service>.<namespace>.svc.cluster.local, which is resolved by CoreDNS using the Service's ClusterIP. This design decouples client pods from the lifecycle of backend pods, enabling zero-downtime scaling and rolling updates.
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 practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Application Deployment and Security — study guide chapter
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FAQ
Questions learners often ask
What does this 200-901 question test?
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Service — A Service in Kubernetes provides a stable virtual IP (ClusterIP) and a DNS name (via CoreDNS) that persists across pod restarts and rescheduling. This allows other pods to reliably discover and communicate with the set of pods behind the Service, regardless of individual pod IP changes.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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