- A
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Correctly selects pods with label app=web-app and maps port 80 to 8080.
- B
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n type: NodePort\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Why wrong: NodePort is not required for in-cluster access; ClusterIP is sufficient.
- C
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 8080\n targetPort: 80\n selector:\n app: web-app
Why wrong: Service port should be 80, not 8080; targetPort should be 8080, not 80.
- D
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Why wrong: The selector is missing the 'app' label key; it should be 'app: web-app'.
CKAD Services and Networking Practice Question
This CKAD practice question tests your understanding of services and networking. 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.
A developer deploys a web application as a Deployment named 'web-app' with 3 replicas. The application listens on port 8080 and should be accessible from within the cluster via the service name 'web-svc' on port 80. Which Service YAML correctly exposes the application?
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
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Option A is correct because it defines a ClusterIP Service (default type) named 'web-svc' that maps port 80 (the service port) to targetPort 8080 (the container port), and uses the selector `app: web-app` to match the Pods created by the Deployment. This allows internal cluster traffic to reach the application on port 80 via the service name, while the application container listens on port 8080.
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.
- ✓
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Why this is correct
Correctly selects pods with label app=web-app and maps port 80 to 8080.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n type: NodePort\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Why it's wrong here
NodePort is not required for in-cluster access; ClusterIP is sufficient.
- ✗
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 8080\n targetPort: 80\n selector:\n app: web-app
Why it's wrong here
Service port should be 80, not 8080; targetPort should be 8080, not 80.
- ✗
apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app
Why it's wrong here
The selector is missing the 'app' label key; it should be 'app: web-app'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `port` and `targetPort`, mistakenly swapping them (as in Option C), or they add unnecessary `type: NodePort` (Option B) when only internal cluster access is required, leading to over-exposure and incorrect configuration.
Detailed technical explanation
How to think about this question
Under the hood, a Kubernetes Service uses iptables or IPVS rules to load-balance traffic to Pods matching the selector. The `port` field defines the service's listening port, while `targetPort` specifies the container port; if omitted, `targetPort` defaults to the same value as `port`. In this scenario, the Deployment's Pods are created with the label `app: web-app` (implicitly from the Deployment template), so the selector must match exactly to route traffic correctly.
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 CKAD 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.
- →
Services and Networking — study guide chapter
Learn the concepts, then practise the questions
- →
Services and Networking practice questions
Targeted practice on this topic area only
- →
All CKAD questions
991 questions across all exam domains
- →
Certified Kubernetes Application Developer CKAD study guide
Full concept coverage aligned to exam objectives
- →
CKAD practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CKAD practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Application Design and Build practice questions
Practise CKAD questions linked to Application Design and Build.
Application Deployment practice questions
Practise CKAD questions linked to Application Deployment.
Application Environment, Configuration and Security practice questions
Practise CKAD questions linked to Application Environment, Configuration and Security.
Application Observability and Maintenance practice questions
Practise CKAD questions linked to Application Observability and Maintenance.
Services and Networking practice questions
Practise CKAD questions linked to Services and Networking.
CKAD fundamentals practice questions
Practise CKAD questions linked to CKAD fundamentals.
CKAD scenario practice questions
Practise CKAD questions linked to CKAD scenario.
CKAD troubleshooting practice questions
Practise CKAD questions linked to CKAD troubleshooting.
Practice this exam
Start a free CKAD practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CKAD question test?
Services and Networking — This question tests Services and Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: apiVersion: v1\nkind: Service\nmetadata:\n name: web-svc\nspec:\n ports:\n - port: 80\n targetPort: 8080\n selector:\n app: web-app — Option A is correct because it defines a ClusterIP Service (default type) named 'web-svc' that maps port 80 (the service port) to targetPort 8080 (the container port), and uses the selector `app: web-app` to match the Pods created by the Deployment. This allows internal cluster traffic to reach the application on port 80 via the service name, while the application container listens on port 8080.
What should I do if I get this CKAD 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 11, 2026
This CKAD practice question is part of Courseiva's free CNCF 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 CKAD exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.