How is CoreDNS typically deployed in a Kubernetes cluster?

As a Deployment with a corresponding Service

As a systemd service on each node

As a static Pod managed by the kubelet

As a DaemonSet running on every node

During a cluster upgrade, the CoreDNS Deployment is accidentally scaled down to zero replicas. The administrator notices that all DNS resolution in the cluster has stopped. What is the quickest way to restore DNS service?

Scale the CoreDNS Deployment back up to the desired number of replicas.

Restart the kubelet on all nodes.

Manually create a pod with the CoreDNS image.

A cluster administrator needs to ensure that CoreDNS does not forward queries for the cluster's own domain (cluster.local) to an external DNS server. What is the correct way to handle this in the Corefile?

Ensure the 'kubernetes' plugin is configured with the 'cluster.local' domain.

Remove the 'forward' plugin from the Corefile entirely.

Add a 'forward' plugin rule for 'cluster.local' that points to 8.8.8.8.

Add a 'rewrite' plugin rule to change 'cluster.local' to 'example.com'.

Certified Kubernetes Administrator (CKA)

Domain 5Objective 6

Understand and Use CoreDNS CKA Practice Questions (Page 1)

Part of the Servicing and Networking domain, which accounts for 20% of the CKA exam. Linux Foundation does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 2–3 from this objective — we provide 22 practice questions to prepare you well beyond it. (estimate)

22questions here

5free pages

6concepts

20%of the exam

Questions 1–5

1foundation · easy
Which CoreDNS plugin is used to forward DNS queries for external domains to an upstream DNS server?
Select an answer first
2foundation · easy
Which file contains the CoreDNS configuration and is typically mounted as a ConfigMap?
Select an answer first
3foundation · easy
How is CoreDNS typically deployed in a Kubernetes cluster?
Select an answer first
4application · easy
During a cluster upgrade, the CoreDNS Deployment is accidentally scaled down to zero replicas. The administrator notices that all DNS resolution in the cluster has stopped. What is the quickest way to restore DNS service?
Select an answer first
5application · medium
A cluster administrator needs to ensure that CoreDNS does not forward queries for the cluster's own domain (cluster.local) to an external DNS server. What is the correct way to handle this in the Corefile?
Select an answer first

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Understand and Use CoreDNS CKA Practice Questions (Page 1)

Questions 1–5

Which CoreDNS plugin is used to forward DNS queries for external domains to an upstream DNS server?

Which file contains the CoreDNS configuration and is typically mounted as a ConfigMap?

How is CoreDNS typically deployed in a Kubernetes cluster?

During a cluster upgrade, the CoreDNS Deployment is accidentally scaled down to zero replicas. The administrator notices that all DNS resolution in the cluster has stopped. What is the quickest way to restore DNS service?

A cluster administrator needs to ensure that CoreDNS does not forward queries for the cluster's own domain (cluster.local) to an external DNS server. What is the correct way to handle this in the Corefile?

Keep studying — Servicing and Networking