Personally I found the encryption processes challenging (IV, Seed, Keystream, XOR etc).
Being a Cisco instructor myself, I see a lot of empty gazes when I go through the OSI model in ICND1 course (no matter how many different colors I use on the whiteboard).
So, for your poll I suggest:
- Encryption processes
- OSI model
Thats funny poop right there... I must have been in your class :) j/k
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