Below I grouped a few links to networking and security related cheat sheets which I find usefull from time to time to use as a reference:

TCP/IP and tcpdump Cheat Sheet – SANS.org

Google Hacking and Defense Cheat Sheet – SANS.org

Intrusion Discovery Cheat Sheet Windows – SANS.org

Intrusion Discovery Cheat Sheet Linux – SANS.org

SQL Injection Cheat Sheet - ha.ckers.org

Cross Site Scripting Cheat Sheet – ha.ckers.org

Web application Cheat Sheet – secguru.com

Linux Security Quick Reference Guide – Linuxsecurity.com

LINUX Administrator’s Quick Reference Card – cheat-sheets.org

Oracle Security Cheat Sheet – red-database-security.com

Nmap & Nessus Cheat Sheet – secguru.com

update: Here are some additional ones:

Security Incident Survey Cheat Sheet – zeltser.com

Initial Security Incident Questionnaire for Responder - zeltser.com

BGP, EIGRP, First Hop Redundancy, 802.1X, IPsec, IPv4 Multicast, IPv6, IS-IS, OSPF , STP, tcpdump, Wireshark, Common Ports, IP Access Lists, Subnetting, Markdown, MediaWiki, MPLS,
QoS, VLANs, Cisco IOS, Physical Terminations Cheat Sheets – packetlife.net

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