If you're about to take SANS 503 and it's been a while since you've had to deal with the world of binary and hex, here are a few good links for refreshing your memory:
http://en.wikipedia.org/wiki/Hexadecimal
http://en.wikipedia.org/wiki/Binary_numeral_system
http://www.underground-security.com/downloads/crew/frostbyte/tutorials/conversions-tutorial.php
http://www.blaenkdenum.com/binary-and-hexadecimal/
http://www.permadi.com/tutorial/numHexToBin/index.html
http://atrevida.comprenica.com/atrtut01.html
http://www.sans.org/training/tcpip_quiz.php
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