IT, cybersecurity and network cheat sheets
Free cheat sheets for IT, cybersecurity and network engineers. Inspection commands for Windows, Active Directory, Entra ID, Azure, FortiGate, Cisco, Juniper, Sophos, Ubiquiti, HPE, Dell and Linux, each with a plain-English walkthrough.
Every sheet lists the command, what it inspects, and how to read the output, with a step-by-step walkthrough and a link to the vendor’s own documentation. All 39 are free, need no account, and print cleanly.
Cloud cheat sheets
- Azure subscription and resource inventory — Check CLI context and inventory resources in the intended subscription.
- Azure virtual network inspection — Inspect virtual networks, subnets and security group inventory.
- Cloud network fundamentals — Connect subnets, routes, security rules, and DNS into one model.
Cybersecurity cheat sheets
- FortiGate CLI essentials — The everyday commands for finding your way around a FortiGate.
- FortiGate HA & system health — Check cluster membership and baseline appliance health.
- FortiGate VPN health — Inspect IPsec tunnel health and security associations.
- FortiGate session inspection — Connect policy decisions with live traffic sessions.
- Kali Burp Suite proxy basics — Inspect requests from a local training application with Burp’s built-in browser.
- Kali Nmap discovery essentials — Discover a lab host’s exposed TCP services and interpret scan states.
- Kali Wireshark packet analysis — Use display filters to inspect DNS, TCP handshakes and one lab conversation.
- Sophos Firewall CLI health checks — Gather appliance version, uptime and resource diagnostics in Device Console.
- Sophos Firewall traffic investigation — Use log filters to connect a connection failure with firewall decisions.
IT fundamentals cheat sheets
- Linux network essentials — A small toolkit for inspecting a Linux host’s network.
- Windows network troubleshooting — Inspect addressing, DNS resolution and TCP reachability with PowerShell.
- Windows services and event logs — Build a focused picture of service state and recent system errors.
Identity & Microsoft 365 cheat sheets
- Active Directory replication health — Compare domain-controller replication and locate recent failures.
- Active Directory users and groups — Inspect domain identity, user status and group membership using RSAT.
- Entra ID devices and tenant overview — Inspect tenant context, device identities and join state without changing access.
- Entra ID sign-in investigation — Review recent sign-ins and distinguish authentication from policy failures.
- Exchange Online mailbox inspection — Connect to Exchange Online and review mailbox identity and quotas.
- Exchange Online message tracing — Trace a recent sender and examine the events for a specific message.
- Microsoft Graph connection and user lookup — Connect to the correct tenant and inspect directory user records.
- Microsoft Graph query and paging basics — Find users with server-side filters and handle complete result sets.
Infrastructure cheat sheets
- Dell Data Domain capacity and health — Inspect filesystem state, capacity and active protection-appliance alerts.
- Dell Data Domain replication checks — Inspect replication contexts and distinguish idle replication from a stalled copy.
- Dell PowerEdge hardware inventory — Capture firmware and hardware inventory before planning maintenance.
- Dell PowerEdge iDRAC health checks — Read PowerEdge identity, power state and hardware event history.
- HPE ProLiant iLO health overview — Read ProLiant health and hardware events through iLO.
Networking cheat sheets
- Cisco IOS essentials — Get oriented, inspect interfaces, and understand your device.
- Cisco VLANs & trunks — Understand access VLANs, tagged links, and Layer 2 boundaries.
- Cisco interface diagnostics — Find link failures and read the counters that matter.
- Cisco neighbor discovery — Map the devices directly connected to your switch.
- Cisco routing basics — Read connected, static, and learned routes with confidence.
- FortiGate routing & ARP — Follow a packet from its next hop to the routing table.
- HPE Aruba CX switching essentials — Inspect AOS-CX switch interfaces and VLANs with platform-specific commands.
- Juniper Junos CLI essentials — Get oriented in Junos operational mode and inspect the chassis.
- Juniper routes and neighbor checks — Inspect routes, ARP entries and discovered neighbors in Junos.
- Ubiquiti UniFi device connectivity — Follow adoption and management connectivity through the UniFi console.
- Ubiquiti UniFi switch port checks — Inspect switch port state, VLAN assignment and PoE budget.