Deal of The Day! Hurry Up, Grab the Special Discount - Save 25% - Ends In 00:00:00 Coupon code: SAVE25
Welcome to Pass4Success

- Free Preparation Discussions
Mail Us support@pass4success.com
Location US
Mob_nav_barsMENU

Linux Foundation KCNA Exam - Topic 5 Question 74 Discussion

What is the main role of the Kubernetes DNS within a cluster?
D) Provides consistent DNS names for Pods and Services for workloads that need to communicate with each other.
A) Acts as a DNS server for virtual machines that are running outside the cluster.
B) Provides a DNS as a Service, allowing users to create zones and registries for domains that they own.
C) Allows Pods running in dual stack to convert IPv6 calls into IPv4 calls.

Linux Foundation KCNA Exam - Topic 5 Question 74 Discussion

Actual exam question for Linux Foundation's KCNA exam
Question #: 74
Topic #: 5
[All KCNA Questions]

What is the main role of the Kubernetes DNS within a cluster?

Show Suggested Answer Hide Answer
Suggested Answer: D

Kubernetes DNS (commonly implemented by CoreDNS) provides service discovery inside the cluster by assigning stable, consistent DNS names to Services and (optionally) Pods, which makes D correct. In a Kubernetes environment, Pods are ephemeral---IP addresses can change when Pods restart or move between nodes. DNS-based discovery allows applications to communicate using stable names rather than hardcoded IPs.

For Services, Kubernetes creates DNS records like service-name.namespace.svc.cluster.local, which resolve to the Service's virtual IP (ClusterIP) or, for headless Services, to the set of Pod endpoints. This supports both load-balanced communication (standard Service) and per-Pod addressing (headless Service, commonly used with StatefulSets). Kubernetes DNS is therefore a core building block that enables microservices to locate each other reliably.

Option A is not Kubernetes DNS's purpose; it serves cluster workloads rather than external VMs. Option B describes a managed DNS hosting product (creating zones/registries), which is outside the scope of cluster DNS. Option C describes protocol translation, which is not the role of DNS. Dual-stack support relates to IP families and networking configuration, not DNS translating IPv6 to IPv4.

In day-to-day Kubernetes operations, DNS reliability impacts everything: if DNS is unhealthy, Pods may fail to resolve Services, causing cascading outages. That's why CoreDNS is typically deployed as a highly available add-on in kube-system, and why DNS caching and scaling are important for large clusters.

So the correct statement is D: Kubernetes DNS provides consistent DNS names so workloads can communicate reliably.

=========


by Arlene at Mar 02, 2026, 08:58 PM

Limited Time Offer

25%

Off

Get Premium KCNA Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

0/2000 characters
Submit Cancel
Felix
17 days ago
But without D, Pods can't find each other easily. That's a big issue!
upvoted 0 times
...
Beth
22 days ago
I’m leaning towards C. Dual stack support is important too.
upvoted 0 times
...
Odette
27 days ago
Agreed! D makes sense. Consistent names are key in clusters.
upvoted 0 times
...
Cammy
1 month ago
I think D is the right answer. It’s crucial for Pods to communicate.
upvoted 0 times
...
Bettye
1 month ago
But without D, Pods can't communicate effectively. That's key!
upvoted 0 times
...
Fletcher
1 month ago
I’m leaning towards C. Dual stack support is important too.
upvoted 0 times
...
James
2 months ago
Agreed! D makes sense. It helps with service discovery.
upvoted 0 times
...
Reita
2 months ago
I think D is the best answer. Consistent DNS names are crucial for Pods.
upvoted 0 times
...
Ronny
2 months ago
Definitely D. Without it, managing services would be chaotic!
upvoted 0 times
...
Rolande
2 months ago
I’m leaning towards D too. It simplifies service discovery.
upvoted 0 times
...
Denna
2 months ago
Agreed! D makes sense. Pods need stable names to connect.
upvoted 0 times
...
Dawne
2 months ago
I think the answer is D. It's crucial for communication in the cluster.
upvoted 0 times
...
Ty
3 months ago
Yup, D is crucial for service discovery in Kubernetes!
upvoted 0 times
...
Elvera
3 months ago
I disagree, B is more about external DNS, not cluster communication.
upvoted 0 times
...
Kristin
4 months ago
Wait, does Kubernetes DNS really handle dual stack? That's wild!
upvoted 0 times
...
Jerry
4 months ago
I thought it was A at first, but D makes more sense.
upvoted 0 times
...
Catina
5 months ago
D is definitely the right answer!
upvoted 0 times
...
Lazaro
5 months ago
Yup, D is crucial for service discovery in Kubernetes!
upvoted 0 times
...
Chantell
5 months ago
I disagree, B is more about external DNS, not cluster communication.
upvoted 0 times
...
Kanisha
5 months ago
Wait, does Kubernetes DNS really handle dual stack? That's wild!
upvoted 0 times
...
Chandra
5 months ago
I thought it was A at first, but D makes more sense.
upvoted 0 times
...
Coleen
6 months ago
D is definitely the right answer!
upvoted 0 times
...
Ines
6 months ago
I vaguely recall that Kubernetes DNS helps with service discovery within the cluster, so I think option D makes the most sense.
upvoted 0 times
...
Bev
6 months ago
I feel like I might be mixing up the roles of DNS in Kubernetes with something else. Wasn't there a question about external DNS servers too?
upvoted 0 times
...
Gabriele
6 months ago
I remember practicing a question about DNS in Kubernetes, and I think it was about providing consistent names for services. That sounds like option D.
upvoted 0 times
...
Hana
6 months ago
I think the main role of Kubernetes DNS is related to how Pods and Services communicate, but I'm not entirely sure which option that is.
upvoted 0 times
...

Save Cancel