Cheat Sheets for System Administrators

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I'd like to start a collection of good, free cheat sheet resources for system administrators. Please add your favorite ones. From the Wikipedia "cheat sheet" article:

In more general usage, a "cheat sheet"
is any short (one or two page)
reference to terms, commands, or
symbols where the user is expected to
understand the use of such terms etc
but not necessarily to have memorized
all of them.

Best Answer

I add my own favorite: Cheat Sheets on PacketLife.com has some very nice ones on network technology topics.

Cheat sheets are in PDF format. You are welcome to use and redistribute them as you please, so long as they remain intact and unmodified.

Currently there are six categories:

  • Protocols: BGP, EIGRP, First Hop Redundancy, IEEE 802.11 Wireless, IEEE 802.1X, IPsec, IPv4 Multicast, IPv6, IS-IS, OSPF, Spanning Tree
  • Applications: tcpdump, Wireshark Display Filters
  • Reference: Common Ports, IP Access Lists, Subnetting
  • Syntax: Markdown, MediaWiki
  • Technologies: MPLS, Quality of Service, VLANs
  • Miscellaneous: Cisco IOS Versions, Physical Terminations

Examples: Common Ports and IPv6 (links to PDF files)

Common Ports Cheat Sheet (PDF)

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