Networking KCNA Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A developer is running a pod in the 'dev' namespace and wants to connect to a Service named 'redis' in the 'cache' namespace. The developer is using the fully qualified domain name (FQDN) 'redis.cache.svc.cluster.local' and the connection is successful. What is the purpose of the 'svc' part in this FQDN?

   • AIt specifies the namespace where the Service is located.
   • BIt is the name of the Service's cluster IP.
   • CIt indicates that the resource is a Service, as opposed to a pod or other resource.
   • DIt is the name of the DNS server that resolves the Service.
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2. 22foundation · easy

   In Kubernetes, what DNS name is automatically created for a Service named `my-app` in the `default` namespace?

   • Amy-app.svc.default.cluster.local
   • Bmy-app.default.svc.cluster.local
   • Cdefault.my-app.svc.cluster.local
   • Dmy-app.cluster.local
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4. 23application · medium

   A company runs a web application in Kubernetes with two services: 'frontend' and 'api'. They want to expose both services externally using a single public IP address, routing traffic based on the URL path: '/app' to 'frontend' and '/api' to 'api'. Which resource should they configure?

   • AA single Ingress resource with rules that route '/app' to the frontend Service and '/api' to the api Service.
   • BTwo separate NodePort Services, one for each application.
   • CA single ClusterIP Service that selects both the frontend and api pods.
   • DA single LoadBalancer Service that exposes both applications on the same port.
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5. 24application · medium

   A team has a Service named 'api' that selects three pods. They notice that traffic is not being evenly distributed among the pods. They suspect that the Service's default load-balancing algorithm is the cause. What is the default load-balancing behavior of a Kubernetes Service?

   • ARound-robin, where each pod receives an equal number of requests in sequence.
   • BRandom selection, where each request is forwarded to a randomly chosen pod.
   • CIP hash, where the client's IP address determines which pod receives the request.
   • DLeast connections, where the pod with the fewest active connections receives the next request.
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6. 25application · medium

   A cluster administrator is setting up a new Kubernetes cluster and wants to ensure that each pod gets a unique IP address from a specific subnet and that pods on different nodes can communicate. Which component is responsible for implementing this pod-to-pod networking?

   • AThe kubelet, which assigns IP addresses to pods.
   • BThe Container Network Interface (CNI) plugin, such as Calico or Flannel.
   • CThe kube-proxy component, which configures iptables rules for Services.
   • DThe CoreDNS service, which resolves pod hostnames to IP addresses.
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