• Sniffers and Anti-sniff
• Only effective on hubs
• snort.org's docs on this
• Can't just cut xmit wires!

 LAN         Sniffer 
  1 -----\   /-- 1
  2 ---\ |   \-- 2
  3 ---+-*------ 3
  4 -  |       - 4
  5 -  |       - 5
  6 ---*-------- 6
  7 -          - 7
  8 -          - 8 

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