Network scanning

["netsec novice" <netsec9 () hotmail com>]

Are there tools out there that would allow system administrators to be 
notified when a new workstation attaches to a network?  I'm thinking both 
wireless and ethernet in this case.  SNMP maybe?  I am in a credit union 
environment and my concern is that someone would be able to steal an 
existing jack or a jack that is not physically protected but live and be 
able to capture traffic or do reconaissance.  We don't have Wireless access 
at this point but may look to it in the future.  My only thought in that 
case would be to encrypt all traffic since wireless security is a bit scary 
at this point.  Any ideas?

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