# Networking Basics (DevOps) > TCP/IP, DNS, HTTP/HTTPS, SSL/TLS, ports, firewalls, load balancers, troubleshooting network issues - 22 interview questions - Junior - [Interview Questions: DevOps](https://sharpskill.dev/en/technologies/devops/interview-questions.md) ## 1. What is the TCP protocol? **Answer** TCP (Transmission Control Protocol) is a reliable transport protocol that guarantees in-order data delivery. It establishes a connection before sending data (3-way handshake) and verifies that each packet is received via acknowledgments. Use TCP for applications requiring reliability like HTTP, HTTPS, SSH or FTP. ## 2. What is the main difference between TCP and UDP? **Answer** TCP is connection-oriented and guarantees reliable in-order data delivery with verification, while UDP is connectionless and sends data without delivery guarantees. TCP is ideal for HTTP, SSH, databases where reliability is critical. UDP is preferred for video streaming, DNS, gaming where low latency matters more than reliability. ## 3. What is the main role of DNS (Domain Name System)? **Answer** DNS translates human-readable domain names (like example.com) into numerical IP addresses (like 93.184.216.34) that machines use to communicate. Without DNS, we would need to memorize IP addresses of all websites. DNS uses hierarchical servers (root, TLD, authoritative) to resolve queries efficiently. ## 19 more questions available - What is the difference between HTTP and HTTPS? - What is an IP address? Sign up for free: https://sharpskill.dev/en/login ## Other DevOps interview topics - [Version Control & Git](https://sharpskill.dev/en/technologies/devops/interview-questions/version-control-git.md): 20 questions, Junior - [Linux Fundamentals](https://sharpskill.dev/en/technologies/devops/interview-questions/linux-fundamentals.md): 22 questions, Junior - [Shell Scripting & Bash](https://sharpskill.dev/en/technologies/devops/interview-questions/shell-scripting-bash.md): 20 questions, Mid-Level - [Docker Fundamentals](https://sharpskill.dev/en/technologies/devops/interview-questions/docker-fundamentals.md): 24 questions, Junior - [CI/CD Fundamentals](https://sharpskill.dev/en/technologies/devops/interview-questions/ci-cd-fundamentals.md): 18 questions, Junior - [GitHub Actions](https://sharpskill.dev/en/technologies/devops/interview-questions/github-actions.md): 22 questions, Mid-Level - [GitLab CI/CD](https://sharpskill.dev/en/technologies/devops/interview-questions/gitlab-ci.md): 22 questions, Mid-Level - [Jenkins](https://sharpskill.dev/en/technologies/devops/interview-questions/jenkins.md): 22 questions, Mid-Level - [Kubernetes Basics](https://sharpskill.dev/en/technologies/devops/interview-questions/kubernetes-basics.md): 26 questions, Mid-Level - [Kubernetes Networking](https://sharpskill.dev/en/technologies/devops/interview-questions/kubernetes-networking.md): 24 questions, Mid-Level - [Kubernetes Advanced](https://sharpskill.dev/en/technologies/devops/interview-questions/kubernetes-advanced.md): 24 questions, Mid-Level - [Ingress & API Gateway](https://sharpskill.dev/en/technologies/devops/interview-questions/ingress-api-gateway.md): 20 questions, Mid-Level - [Terraform Basics](https://sharpskill.dev/en/technologies/devops/interview-questions/terraform-basics.md): 22 questions, Mid-Level - [Terraform Advanced](https://sharpskill.dev/en/technologies/devops/interview-questions/terraform-advanced.md): 22 questions, Mid-Level - [Ansible & Configuration Management](https://sharpskill.dev/en/technologies/devops/interview-questions/ansible-configuration.md): 20 questions, Mid-Level - [AWS Essentials](https://sharpskill.dev/en/technologies/devops/interview-questions/aws-essentials.md): 26 questions, Mid-Level - [Azure Fundamentals](https://sharpskill.dev/en/technologies/devops/interview-questions/azure-fundamentals.md): 22 questions, Mid-Level - [GCP Fundamentals](https://sharpskill.dev/en/technologies/devops/interview-questions/gcp-fundamentals.md): 22 questions, Mid-Level - [Monitoring & Prometheus](https://sharpskill.dev/en/technologies/devops/interview-questions/monitoring-prometheus.md): 22 questions, Mid-Level - [Logging & ELK Stack](https://sharpskill.dev/en/technologies/devops/interview-questions/logging-elk.md): 20 questions, Mid-Level - [Alerting & Incident Response](https://sharpskill.dev/en/technologies/devops/interview-questions/alerting-incident-response.md): 20 questions, Mid-Level - [Cloud Identity & Secrets](https://sharpskill.dev/en/technologies/devops/interview-questions/cloud-identity-secrets.md): 22 questions, Mid-Level - [CI/CD Pipeline Security](https://sharpskill.dev/en/technologies/devops/interview-questions/cicd-pipeline-security.md): 20 questions, Mid-Level - [Helm & Kubernetes](https://sharpskill.dev/en/technologies/devops/interview-questions/helm-kubernetes.md): 20 questions, Mid-Level - [Runtime & Cluster Security](https://sharpskill.dev/en/technologies/devops/interview-questions/runtime-cluster-security.md): 24 questions, Senior - [Container Supply Chain Security](https://sharpskill.dev/en/technologies/devops/interview-questions/container-supply-chain.md): 22 questions, Senior - [Service Mesh & Istio](https://sharpskill.dev/en/technologies/devops/interview-questions/service-mesh-istio.md): 24 questions, Senior - [GitOps & ArgoCD](https://sharpskill.dev/en/technologies/devops/interview-questions/gitops-argocd.md): 22 questions, Senior - [Progressive Delivery](https://sharpskill.dev/en/technologies/devops/interview-questions/progressive-delivery.md): 20 questions, Senior - [Distributed Observability](https://sharpskill.dev/en/technologies/devops/interview-questions/observability-distributed.md): 22 questions, Senior - [Disaster Recovery & Backup](https://sharpskill.dev/en/technologies/devops/interview-questions/disaster-recovery.md): 20 questions, Senior - [Performance Optimization](https://sharpskill.dev/en/technologies/devops/interview-questions/performance-optimization.md): 22 questions, Senior - [Cloud Cost Optimization](https://sharpskill.dev/en/technologies/devops/interview-questions/infrastructure-cost.md): 20 questions, Senior - [SRE Principles](https://sharpskill.dev/en/technologies/devops/interview-questions/sre-principles.md): 24 questions, Senior - [Chaos Engineering](https://sharpskill.dev/en/technologies/devops/interview-questions/chaos-engineering.md): 20 questions, Senior - [Platform Engineering](https://sharpskill.dev/en/technologies/devops/interview-questions/platform-engineering.md): 22 questions, Senior --- Source: SharpSkill (https://sharpskill.dev), tech interview preparation for your real stack. 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