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Free printable PDF cheat sheets: subnetting, Cisco IOS, Linux, Windows and ports.
Free printable cheat sheets to keep beside you while you study or work. Download, print, or save them on your phone. Free for personal study; please don't sell or republish them.
IPv4 subnetting cheat sheetEvery prefix from /8 to /32 with mask, wildcard, host count and block size, plus private ranges and a fast method.2 pages · A4 · 139 KB
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Cisco IOS commands cheat sheetThe everyday Cisco IOS commands for switches and routers: modes, basic setup, interfaces, VLANs, routing, OSPF, ACLs and troubleshooting.2 pages · A4 · 142 KB
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Linux commands cheat sheetEssential Linux commands for files, users, processes, networking, logs and security, with short plain-English explanations.2 pages · A4 · 133 KB
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Windows network commands cheat sheetCommand Prompt and PowerShell commands for checking IP settings, DNS, connections, Wi-Fi and common fixes on Windows 10 and 11.1 page · A4 · 127 KB
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Common ports and protocols cheat sheetThe well-known TCP and UDP ports every network and security learner should know, with secure alternatives and quick tips.1 page · A4 · 119 KB
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VLANs and Spanning Tree cheat sheetVLAN, trunk, inter-VLAN routing and Spanning Tree (STP, RSTP) concepts and Cisco commands on two pages, with common faults and fixes.2 pages · A4 · 131 KB
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OSPF cheat sheetOSPFv2 essentials: how it works, neighbour states, areas, LSA types, cost, DR/BDR election and the Cisco commands to configure and troubleshoot it.1 page · A4 · 132 KB
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Firewall basics cheat sheetFirewall types, how rules are processed, zones and DMZ, NAT, a safe rule-writing checklist and the troubleshooting steps that solve most blocked traffic.1 page · A4 · 128 KB
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Wi-Fi troubleshooting checklistA step-by-step checklist for slow or dropping Wi-Fi at home or in the office: signal, channels, bands, DHCP, DNS and the commands that prove where the fault is.1 page · A4 · 122 KB
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