>> Use a shared hub. A shared hub can be plugged into the wall jack. You can then plug the user's desktop and your laptop into the shared hub and see all the packets. This setup could introduce problems, however, if the devices involved don't autonegotiate correctly.
>> Span or mirror traffic from a switch. Many switches can send all traffic from one or more ports out another port, to which an analyzer can be attached. This setup works best for monitoring backbone connections--it's difficult to coordinate a client's desktop symptoms with the associated packets. A variation would be to plug a switch into the wall jack near the desktop.
>> Use taps. Hardware taps from companies such as Datacom Systems and Net Optics will tap into a full-duplex connection and send a copy of the traffic out another port for the analyzer.
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