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Phase 3 · Networking Fundamentals

Topics

DNS

Part of the DevOps Roadmap.

Summary

The Domain Name System translates human-readable domain names into IP addresses — understanding record types (A, CNAME, MX, TXT) and propagation is essential for deploying and debugging any web-facing service.

How to Learn This

  • 1Run dig or nslookup on a domain to see DNS resolution in action.
  • 2Learn the difference between A, CNAME, MX and TXT records and when each is used.
  • 3Understand DNS propagation delay and why DNS changes aren't instant everywhere.

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IP Addressing & Subnetting

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HTTP/HTTPS & TLS

More topics in Networking Fundamentals

OSI & TCP/IP ModelsIP Addressing & SubnettingHTTP/HTTPS & TLSLoad BalancersFirewalls & Security GroupsReverse Proxies (Nginx)VPNs & Private NetworkingCommon Network Troubleshooting
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