Networking for DevOps Engineers – Quick Interview Refresher Guide

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• Create Date January 10, 2025
• Last Updated January 10, 2025

Networking for DevOps Engineers

1. Introduction to Networking
   • Definition and purpose of a network.
   • Types of networks: LAN, WAN, MAN, SONET.
2. Network Components
   • Switches, routers, modems, hubs, NICs, and bridges.
3. Network Protocols
   • Explanation of protocols: HTTP, TCP, IP, FTP, SMTP.
   • IP addressing: IPv4 and IPv6, public and private IPs, static and dynamic IPs.
4. IP Addressing
   • Classes of IP addresses: Class A, B, C, D, E.
   • Loopback address and its purpose.
   • Subnetting and CIDR (Classless Inter-Domain Routing).
5. Network Models
   • OSI Model: 7 layers with their functions and protocols.
   • TCP/IP Model: 4 layers and comparison with OSI.
6. Routing and DNS
   • Concepts of routing and route tables.
   • DNS (Domain Name System) structure and functionality.
   • Common DNS record types: A, AAAA, MX, TXT, etc.
7. Network Services
   • DHCP (Dynamic Host Configuration Protocol).
   • Firewalls, load balancers, and VPNs.
8. Network Troubleshooting Tools
   • Tools: ping, traceroute, telnet, curl, dig, netstat, nmap, and ssh.
   • Usage and purpose of these tools in debugging and network analysis.
9. HTTP and Related Concepts
   • HTTP request/response model.
   • Status codes and their categories: 2xx, 3xx, 4xx, 5xx.
   • Role of cookies.
10. File and Email Transfer Protocols
    • SMTP/POP for email.
    • FTP for file transfers.
    • Secure Shell (SSH) for secure access and management.
11. Network Security
    • Overview of network security principles and practices.