Quick-reference cheat sheets for the IT certifications that actually get you hired — CompTIA Security+ (SY0-701), Network+ (N10-009), A+, Cisco CCNA (200-301), AWS CLF-C02, and Microsoft AZ-900.
No fluff. Just the tables, commands, and mnemonics you need on exam day.
⭐ Star this repo if it helps you pass — it keeps these sheets free and updated.
| Cheat Sheet | What it covers | Good for |
|---|---|---|
| Subnetting Cheat Sheet | CIDR notation, subnet masks, block-size trick, private ranges (RFC 1918) | Network+, CCNA, Security+ |
| Common Network Ports | 20+ must-know TCP/UDP ports, what each service does | Network+, Security+, CCNA |
| OSI Model Cheat Sheet | All 7 layers, protocols, devices, mnemonics | Network+, Security+, CCNA |
| TCP vs UDP | Head-to-head comparison, 3-way handshake, when to use which | Network+, Security+ |
| Wi-Fi Standards | 802.11a/b/g/n/ac/ax/be — frequencies, speeds, channels, WPA versions | Network+, Security+ |
| Linux Commands | 40+ essential commands: files, permissions, networking, systemd | A+, Network+, Security+ |
| PowerShell Commands | Core cmdlets, aliases, and admin one-liners | A+, AZ-900 |
Cheat sheets are the quick reference. The full exam-weighted study guides ($5) and practice question packs ($3) are at bytebarhq.com.
Found a mistake or want to add a sheet? Open an issue or a pull request — these stay accurate because the community keeps them sharp.
Built by ByteBar — sweet IT skills, no fluff.