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I cannot BELIEVE I have never heard of this type of document.. I know how to search for things, but this is REALLY useful.  http://packetlife.net/library/cheat-sheets/

Cheat Sheets - http://packetlife.net/library/cheat-sheets/

Interior Routing Protocols poster now available!

Protocols

BGP

version 2.0 (2 pages)

EIGRP

version 2.0 (1 page)

First Hop Redundancy

version 2.0 (1 page)

IEEE 802.11 WLAN

version 2.1 (2 pages)

IEEE 802.1X

version 2.0 (1 page)

IPsec

version 2.0 (1 page)

IPv4 Multicast

version 2.0 (1 page)

IPv6

version 2.0 (1 page)

IS-IS

version 2.0 (2 pages)

OSPF

version 2.1 (2 pages)

PPP

version 1.01 (1 page)

Spanning Tree

version 2.0 (2 pages)

Applications

tcpdump

version 2.0 (1 page)

Wireshark Display Filters

version 2.0 (2 pages)

Reference

Common Ports