Simulating Attacks

[Bhargav Bhikkaji <bbhikkaji () yahoo co in>]

Hello Folks,

I am in need of simulating few attacks as demo to a group of 50. Need your help/suggestion for choosing the following

1) What attacks should i choose ?
2) How to simulate these attacks? 

I am thinking of few attacks like Buffer Overflow, TCP Hijacking but  don't know how much effort is needed to simulate 
these. I am not interested in TCP or ICMP DOS Attacks.

-Bhargav 

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