Linux Foundation CKA Certification Exam Sample Questions

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Linux Foundation CKA Sample Questions:

01. A custom kubeconfig is saved at /root/my-kube-config. You must list the user names defined in it. Which command outputs just the user names from that file?
a) kubectl get users --kubeconfig=/root/my-kube-config
b) kubectl config view --kubeconfig=/root/my-kube-config -o jsonpath='{.users[*].name}'
c) kubectl config get-users --kubeconfig=/root/my-kube-config
d) kubectl config view --kubeconfig=/root/my-kube-config -o jsonpath='{.clusters[*].name}'
 
02. You need the full list of cluster nodes in JSON so it can be saved to a file at /opt/outputs/nodes.json. Which command outputs the nodes as JSON?
a) kubectl get nodes -o yaml
b) kubectl describe nodes --json
c) kubectl get nodes -o json
d) kubectl get nodes --output=wide
 
03. A Deployment is scaled to 2 replicas, but no new Pods are created. The component responsible for reconciling Deployments and ReplicaSets into the desired number of Pods appears to be failing.
Which control-plane component should you investigate?
a) kube-controller-manager
b) kube-scheduler
c) kubelet
d) kube-apiserver
 
04. You need to add a worker node to an existing cluster using a bootstrap token already generated on the control plane. Which command, run on the worker node, joins it to the cluster?
a) kubectl join with the token
b) kubeadm join with the control-plane endpoint, --token and --discovery-token-ca-cert-hash
c) kubeadm token create on the worker node
d) kubeadm init on the worker node
 
05. Using the official ingress-nginx installation manifests, the controller is created in the ingress-nginx namespace. What is the name of the controller Deployment?
a) ingress-nginx-controller
b) nginx-ingress-controller
c) nginx-ingress
d) ingress-controller
 
06. A Service named web-service runs in the payroll namespace. A Pod in another namespace resolves it through cluster DNS. Which of the following names CANNOT be used to reach the Service?
a) web-service.payroll.svc
b) web-service.payroll
c) web-service.payroll.svc.cluster
d) web-service.payroll.svc.cluster.local
 
07. CoreDNS runs as the cluster DNS server and reads its configuration (the Corefile) from a ConfigMap in the kube-system namespace. What is the name of that ConfigMap?
a) coredns
b) dns-config
c) corefile-config
d) kube-proxy
 
08. A Service named web-service runs in the payroll namespace. A test application in a different namespace needs to reach it by DNS. Which name resolves to that Service?
a) web-service.default
b) web-service.payroll
c) web
d) web-service
 
09. Pods resolve Service names through the cluster DNS Service, which is backed by CoreDNS and reachable at a fixed ClusterIP that the kubelet configures in each Pod's /etc/resolv.conf.
Which IP is the cluster DNS Service typically assigned?
a) 10.244.1.2
b) 8.8.8.8
c) 192.168.1.1
d) 10.96.0.10
 
10. You are initializing the first control-plane node and must set the Pod network CIDR to 10.244.0.0/16 along with the API server advertise address and an extra certificate SAN.
Which command initializes the control plane?
a) kubeadm init --service-cidr=10.244.0.0/16
b) kubeadm config init --pod-network-cidr=10.244.0.0/16
c) kubeadm init --apiserver-advertise-address=<eth0-ip> --apiserver-cert-extra-sans=controlplane --pod-network-cidr=10.244.0.0/16
d) kubeadm join --pod-network-cidr=10.244.0.0/16

Answers:

Question: 01
Answer: b		 Question: 02
Answer: c		 Question: 03
Answer: a		 Question: 04
Answer: b		 Question: 05
Answer: a
Question: 06
Answer: c		 Question: 07
Answer: a		 Question: 08
Answer: b		 Question: 09
Answer: d		 Question: 10
Answer: c

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