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Subnetting Introduction

[Intro — 0:00] “Ever wonder how your computer knows who’s on the same network and who’s not? That’s subnetting — the secret sauce of IP networking.” [Part 1: The Basics — 0:30] An IP address looks like this: 192.168.1.10 It has two parts: Network part — tells which network you’re on. Host part — tells which device you are. Example: 192.168.1.0/24 → means: Network = 192.168.1 Hosts = .1 to .254 /24 means 24 bits for the network → 255.255.255.0 [Part 2: Why Subnet? — 2:00] You split one big network into smaller ones to: Improve performance Enhance security Manage IPs efficiently Example: 192.168.1.0/24 → too big? Split into: 192.168.1.0/26 (64 IPs) 192.168.1.64/26 192.168.1.128/26 192.168.1.192/26 [Part 3: How to Subnet — 4:00] Steps: Write the subnet mask in binary. Borrow bits from the host portion to make more subnets. Calculate: Network address Broadcast address Valid host range Example: 192.168.1.0/26 → Subnet mask = 255.255.255.192 → 62 usable hosts per subnet. [Part 4: Quick Practice — 6:00] Q: You need 5 networks with 30 hosts each. A: Use /27 (32 IPs, 30 usable).