Kubernetes · Networking interview questions

54 real Kubernetes · Networking questions from the DevOps & SRE bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is Service?

Junior
  1. A.a spec controlling allowed ingress and egress traffic between pods
  2. B.a Service type that exposes the service on a static port on every node
  3. C.a Service type that provisions an external cloud load balancer for the service
  4. D.a stable virtual IP and DNS name that load-balances traffic to a set of pods
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3. Which statement is correct?

Junior
  1. A.Service — the default Service type exposing the service on an internal cluster-only IP
  2. B.Service — an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  3. C.Service — the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  4. D.Service — a stable virtual IP and DNS name that load-balances traffic to a set of pods
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4. What is ClusterIP?

Junior
  1. A.an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  2. B.the default Service type exposing the service on an internal cluster-only IP
  3. C.a Service with no cluster IP that returns pod IPs directly for stateful discovery
  4. D.the cluster's DNS server that resolves service and pod names
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6. Which statement is correct?

Junior
  1. A.ClusterIP — the default Service type exposing the service on an internal cluster-only IP
  2. B.ClusterIP — the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  3. C.ClusterIP — a Service with no cluster IP that returns pod IPs directly for stateful discovery
  4. D.ClusterIP — a Service type that exposes the service on a static port on every node
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7. What is NodePort?

Junior
  1. A.the default Service type exposing the service on an internal cluster-only IP
  2. B.an API object managing external HTTP/HTTPS routing to services based on host and path rules
  3. C.a Service with no cluster IP that returns pod IPs directly for stateful discovery
  4. D.a Service type that exposes the service on a static port on every node
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9. Which statement is correct?

Junior
  1. A.NodePort — the node component that programs network rules to implement Service load balancing
  2. B.NodePort — an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  3. C.NodePort — a Service type that exposes the service on a static port on every node
  4. D.NodePort — a spec controlling allowed ingress and egress traffic between pods
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10. What is LoadBalancer?

Junior
  1. A.a Service type that provisions an external cloud load balancer for the service
  2. B.the cluster's DNS server that resolves service and pod names
  3. C.the node component that programs network rules to implement Service load balancing
  4. D.a Service type that exposes the service on a static port on every node
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12. Which statement is correct?

Junior
  1. A.LoadBalancer — an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  2. B.LoadBalancer — a Service type that provisions an external cloud load balancer for the service
  3. C.LoadBalancer — the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  4. D.LoadBalancer — the default Service type exposing the service on an internal cluster-only IP
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13. What is Ingress?

Junior
  1. A.the default Service type exposing the service on an internal cluster-only IP
  2. B.the cluster's DNS server that resolves service and pod names
  3. C.the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  4. D.an API object managing external HTTP/HTTPS routing to services based on host and path rules
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15. Which statement is correct?

Junior
  1. A.Ingress — an API object managing external HTTP/HTTPS routing to services based on host and path rules
  2. B.Ingress — a Service type that exposes the service on a static port on every node
  3. C.Ingress — the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  4. D.Ingress — a stable virtual IP and DNS name that load-balances traffic to a set of pods
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16. What is CNI plugin?

Mid
  1. A.a networking plugin implementing the Container Network Interface to wire pod connectivity
  2. B.an API object managing external HTTP/HTTPS routing to services based on host and path rules
  3. C.an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  4. D.a Service type that exposes the service on a static port on every node
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18. Which statement is correct?

Mid
  1. A.CNI plugin — a Service with no cluster IP that returns pod IPs directly for stateful discovery
  2. B.CNI plugin — the cluster's DNS server that resolves service and pod names
  3. C.CNI plugin — a networking plugin implementing the Container Network Interface to wire pod connectivity
  4. D.CNI plugin — an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
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19. What is CoreDNS?

Mid
  1. A.the node component that programs network rules to implement Service load balancing
  2. B.the cluster's DNS server that resolves service and pod names
  3. C.a Service type that provisions an external cloud load balancer for the service
  4. D.a Service type that exposes the service on a static port on every node
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21. Which statement is correct?

Mid
  1. A.CoreDNS — a stable virtual IP and DNS name that load-balances traffic to a set of pods
  2. B.CoreDNS — the default Service type exposing the service on an internal cluster-only IP
  3. C.CoreDNS — the cluster's DNS server that resolves service and pod names
  4. D.CoreDNS — a Service type that provisions an external cloud load balancer for the service
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22. What is Headless Service?

Mid
  1. A.a Service type that exposes the service on a static port on every node
  2. B.a Service with no cluster IP that returns pod IPs directly for stateful discovery
  3. C.an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  4. D.the default Service type exposing the service on an internal cluster-only IP
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24. Which statement is correct?

Mid
  1. A.Headless Service — a Service with no cluster IP that returns pod IPs directly for stateful discovery
  2. B.Headless Service — a networking plugin implementing the Container Network Interface to wire pod connectivity
  3. C.Headless Service — a Service type that exposes the service on a static port on every node
  4. D.Headless Service — the node component that programs network rules to implement Service load balancing
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25. What is NetworkPolicy?

Mid
  1. A.the default Service type exposing the service on an internal cluster-only IP
  2. B.an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
  3. C.a spec controlling allowed ingress and egress traffic between pods
  4. D.the node component that programs network rules to implement Service load balancing
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27. Which statement is correct?

Mid
  1. A.NetworkPolicy — a spec controlling allowed ingress and egress traffic between pods
  2. B.NetworkPolicy — a Service type that exposes the service on a static port on every node
  3. C.NetworkPolicy — the cluster's DNS server that resolves service and pod names
  4. D.NetworkPolicy — a networking plugin implementing the Container Network Interface to wire pod connectivity
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28. What is Gateway API?

Senior
  1. A.a Service type that exposes the service on a static port on every node
  2. B.the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  3. C.the default Service type exposing the service on an internal cluster-only IP
  4. D.a Service type that provisions an external cloud load balancer for the service
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30. Which statement is correct?

Senior
  1. A.Gateway API — the node component that programs network rules to implement Service load balancing
  2. B.Gateway API — a Service type that provisions an external cloud load balancer for the service
  3. C.Gateway API — the successor to Ingress providing role-oriented, extensible L4/L7 traffic routing
  4. D.Gateway API — an infrastructure layer (e.g. Istio, Linkerd) handling service-to-service traffic, mTLS, and observability via sidecars
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