f.service.md network policy example does not block the service about ckad-exercises HOT 3 CLOSED

Are you using a network provider that supports Network Policy on your Minikube cluster? Check here for reference.
I'll update the exercise for clarity

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Feel free to re-open if you think issue is unresolved :)

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No need. It worked after I followed your hint and added Cilium to my minikube on Ubuntu 16.04. Commands below

minikube stop; minikube delete; rm -rf ~/.minikube # will reset minikube completely
curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
chmod +x minikube && sudo mv minikube /usr/local/bin/
minikube start --network-plugin=cni --memory=4096
kubectl create -f https://raw.githubusercontent.com/cilium/cilium/v1.5/examples/kubernetes/1.14/cilium-minikube.yaml

Added links to official documentation before an exercise. Sending a pull request your way. You can check the final look at my fork https://github.com/askrht/CKAD-exercises

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