Google Analytics Regular Expressions Cheat Sheet
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Google Analytics Regular Expressions Cheat Sheet

Analytics supports regular expressions so you can create more flexible definitions for things like view filters, goals, segments, audiences, content groups, and channel groupings. In the context of Analytics, regular expressions are specific sequences of characters that broadly or narrowly match patterns in your Analytics data.

IPv6 cheat sheet
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IPv6 cheat sheet

Find very useful cheat sheet of IPv6 – the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.

Tcpdump cheat sheet
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Tcpdump cheat sheet

Tcpdump is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license, tcpdump is free software.

IPsec cheat sheet #1
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IPsec cheat sheet #1

Find a very useful cheat sheet of well-known Internet Protocol Security (IPsec) – a protocol suite for secure Internet Protocol (IP) communications that works by authenticating and encrypting each IP packet of a communication session.