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IP Subnetting and CIDR in 10 Minutes — A Practical Guide

Complete beginner guide to IPv4 addresses, CIDR prefix notation, calculating usable hosts, subnet masks, RFC 1918 private ranges, and CLI tools.

DNS A and AAAA Records — Pointing Domains at IP Addresses

Complete beginner guide to IPv4 A records and IPv6 AAAA records, dual-stack configurations, TTL tuning strategies, and CLI verification with dig.