Subnetting Cheat Sheet (IPv4)
Quick reference for CIDR, subnet masks, usable hosts, wildcard masks, and the “magic number” block size.
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Subnetting: CIDR ↔ Mask ↔ Usable Hosts ↔ Block Size (+ quick tips)
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Email is disabled (no outgoing emails) — how to stay updated & get help
Email is disabled for now — here’s what that means
Our hosting provider does not allow outbound email from this server. To keep things simple... -
Thread Prefixes — What they are, why they help, and how to use them
Thread Prefixes — What they are, why they help, and how to use them
Prefixes are short labels (like [Help], [Solved], [HowTo]) that appear... -
Welcome to Introductions!
Welcome to Introductions 👋
Say hi! This section helps everyone connect, form study groups, and understand what you’re working toward. Keep it... -
The OSI Model — What Each Layer Does (with examples & quick labs)
The OSI Model — What Each Layer Does
This is your quick, practical guide to the 7-layer OSI model. Use it to understand where things break and how... -
About “Announcements & Site Feedback” (How to use this section)
About “Announcements & Site Feedback”
Welcome! This section has two jobs:- Announcements — Official updates from the team: new features,
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Site Rules
Forum Rules — Read First
Welcome! This community helps people learn networking and share knowledge. Keep it friendly, safe, and useful for everyone....