# Kubernetes 네트워킹 (DevOps) > CNI (Calico, Cilium), NetworkPolicies, kube-proxy, CoreDNS, Service mesh 기초, DNS 지연 문제 해결 - 24 면접 질문 - Mid-Level - [면접 질문: DevOps](https://sharpskill.dev/ko/technologies/devops/interview-questions.md) ## 1. Kubernetes에서 CNI(Container Network Interface)란 무엇입니까? **답변** CNI는 Kubernetes에서 컨테이너용 네트워크 인터페이스를 구현하는 플러그인입니다. Pod에 IP 주소를 할당하고 Pod 간 통신을 가능하게 하는 네트워크를 구성하는 역할을 합니다. 모든 Kubernetes 클러스터는 작동을 위해 CNI가 필요하며, CNI 선택은 NetworkPolicies와 같은 사용 가능한 네트워크 기능이나 성능에 영향을 미칩니다. ## 2. Kubernetes 클러스터에서 kube-proxy의 주요 역할은 무엇입니까? **답변** kube-proxy는 Kubernetes Service로의 통신을 가능하게 하기 위해 각 노드에서 네트워크 규칙을 유지합니다. iptables, IPVS 또는 nftables 규칙을 구성하여 해당 Pod로 트래픽을 라우팅함으로써 Service 개념을 구현합니다. kube-proxy 없이는 Service가 작동하지 않으며 애플리케이션은 안정적인 ClusterIP 주소를 통해 통신할 수 없습니다. ## 3. Kubernetes에서 CoreDNS의 기능은 무엇입니까? **답변** CoreDNS는 Kubernetes 클러스터 내에서 DNS 해결을 제공하여 Pod가 이름으로 Service를 검색할 수 있게 합니다. service.namespace.svc.cluster.local 형식의 이름을 해당 ClusterIP 주소로 자동 해결합니다. CoreDNS는 service-to-service 통신에 필수적이며 Kubernetes 1.13 이후 kube-dns를 대체합니다. ## 21개 추가 질문 이용 가능 - 클러스터의 각 노드에서 포트를 노출하는 Kubernetes Service 유형은 무엇입니까? - Calico와 Flannel의 주요 차이점은 무엇입니까? 무료로 가입하기: https://sharpskill.dev/ko/login ## 기타 DevOps 면접 주제 - [버전 관리 & Git](https://sharpskill.dev/ko/technologies/devops/interview-questions/version-control-git.md): 20개 질문, Junior - [Linux 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/linux-fundamentals.md): 22개 질문, Junior - [Shell Scripting & Bash](https://sharpskill.dev/ko/technologies/devops/interview-questions/shell-scripting-bash.md): 20개 질문, Mid-Level - [네트워킹 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/networking-basics.md): 22개 질문, Junior - [Docker 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/docker-fundamentals.md): 24개 질문, Junior - [CI/CD 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/ci-cd-fundamentals.md): 18개 질문, Junior - [GitHub Actions](https://sharpskill.dev/ko/technologies/devops/interview-questions/github-actions.md): 22개 질문, Mid-Level - [GitLab CI/CD](https://sharpskill.dev/ko/technologies/devops/interview-questions/gitlab-ci.md): 22개 질문, Mid-Level - [Jenkins](https://sharpskill.dev/ko/technologies/devops/interview-questions/jenkins.md): 22개 질문, Mid-Level - [Kubernetes 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/kubernetes-basics.md): 26개 질문, Mid-Level - [Kubernetes 고급](https://sharpskill.dev/ko/technologies/devops/interview-questions/kubernetes-advanced.md): 24개 질문, Mid-Level - [Ingress & API Gateway](https://sharpskill.dev/ko/technologies/devops/interview-questions/ingress-api-gateway.md): 20개 질문, Mid-Level - [Terraform 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/terraform-basics.md): 22개 질문, Mid-Level - [Terraform 고급](https://sharpskill.dev/ko/technologies/devops/interview-questions/terraform-advanced.md): 22개 질문, Mid-Level - [Ansible & Configuration Management](https://sharpskill.dev/ko/technologies/devops/interview-questions/ansible-configuration.md): 20개 질문, Mid-Level - [AWS 핵심](https://sharpskill.dev/ko/technologies/devops/interview-questions/aws-essentials.md): 26개 질문, Mid-Level - [Azure 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/azure-fundamentals.md): 22개 질문, Mid-Level - [GCP 기초](https://sharpskill.dev/ko/technologies/devops/interview-questions/gcp-fundamentals.md): 22개 질문, Mid-Level - [모니터링과 Prometheus](https://sharpskill.dev/ko/technologies/devops/interview-questions/monitoring-prometheus.md): 22개 질문, Mid-Level - [Logging & ELK Stack](https://sharpskill.dev/ko/technologies/devops/interview-questions/logging-elk.md): 20개 질문, Mid-Level - [알림 및 인시던트 대응](https://sharpskill.dev/ko/technologies/devops/interview-questions/alerting-incident-response.md): 20개 질문, Mid-Level - [Cloud Identity & Secrets](https://sharpskill.dev/ko/technologies/devops/interview-questions/cloud-identity-secrets.md): 22개 질문, Mid-Level - [CI/CD 파이프라인 보안](https://sharpskill.dev/ko/technologies/devops/interview-questions/cicd-pipeline-security.md): 20개 질문, Mid-Level - [Helm & Kubernetes](https://sharpskill.dev/ko/technologies/devops/interview-questions/helm-kubernetes.md): 20개 질문, Mid-Level - [런타임 및 클러스터 보안](https://sharpskill.dev/ko/technologies/devops/interview-questions/runtime-cluster-security.md): 24개 질문, Senior - [Container Supply Chain Security](https://sharpskill.dev/ko/technologies/devops/interview-questions/container-supply-chain.md): 22개 질문, Senior - [Service Mesh & Istio](https://sharpskill.dev/ko/technologies/devops/interview-questions/service-mesh-istio.md): 24개 질문, Senior - [GitOps & ArgoCD](https://sharpskill.dev/ko/technologies/devops/interview-questions/gitops-argocd.md): 22개 질문, Senior - [Progressive Delivery](https://sharpskill.dev/ko/technologies/devops/interview-questions/progressive-delivery.md): 20개 질문, Senior - [분산 옵저버빌리티](https://sharpskill.dev/ko/technologies/devops/interview-questions/observability-distributed.md): 22개 질문, Senior - [Disaster Recovery & Backup](https://sharpskill.dev/ko/technologies/devops/interview-questions/disaster-recovery.md): 20개 질문, Senior - [성능 최적화](https://sharpskill.dev/ko/technologies/devops/interview-questions/performance-optimization.md): 22개 질문, Senior - [클라우드 비용 최적화](https://sharpskill.dev/ko/technologies/devops/interview-questions/infrastructure-cost.md): 20개 질문, Senior - [SRE 원칙](https://sharpskill.dev/ko/technologies/devops/interview-questions/sre-principles.md): 24개 질문, Senior - [Chaos Engineering](https://sharpskill.dev/ko/technologies/devops/interview-questions/chaos-engineering.md): 20개 질문, Senior - [Platform Engineering](https://sharpskill.dev/ko/technologies/devops/interview-questions/platform-engineering.md): 22개 질문, Senior --- Source: SharpSkill (https://sharpskill.dev), tech interview preparation for your real stack. 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