Reference Sheets
Study Resources
Printable reference sheets for exam prep. Open one to preview, then use your browser's Print / Save as PDF to download.
A+ Exam
Common Ports & Protocols
Quick-reference table of exam-relevant port numbers, TCP/UDP classifications, service names, and memory hooks. Covers FTP, SSH, SMTP, DNS, DHCP, HTTP, RDP, SMB, and more.
Networking
Subnet Cheat Sheet
CIDR notation, netmask lookup, the slash-divide-8 mental shortcut, broadcast and host range rules, the 5-question flow, a worked example, and four practice problems including a split-octet /25.
OS & Networking
CLI Commands Cheat Sheet
Windows CMD, PowerShell, and Linux Bash commands for network diagnostics, process management, file system ops, system info, disk tools, and user management. Includes .msc shortcuts, Linux log paths, and signal quick-reference.