Difficulty Rating: Varies
Methods:
Idea: (Syn flood) Flood the target with a bunch of half-open connections. This should either deny the service or crash the server.
Problem: O.S.'s have been upgraded. Only lasts as long as you keep sending packets. Can be traced.
Bonus: Works against http servers too.Idea: Analyse network traffic patterns. Discover enemy movements.
Problem: It needs to be a litterally broadcast network. Can be fooled by sending fake data.Idea: Sniff passwords on the net.
Problem: Many hubs won't allow this. Need access to local network.