I've been seeing these for almost 2 years. It is being caused on my network by roaming wireless symbol devices according to the debug of the ethernet controller.
The aP's apparently aren't letting the Cisco Spanning tree Switches know that a specific mac has "left the building" and...
I would practice end of chapter excersises on the simulator and not a real switch....that will train you for the obnoxious scroll bars that you must navigate to read both the scenario and the task requests. One thing I couldn't seem to be able to do was refer back to the diagram in the middle...
the test is 88 questions and 120 minutes as late as october 6th. I took it for a recert using the older bcmsn and bcsn .....There were at least 6 simulations which demanded multiple objectives be completed. I kinda gave up on the lot of them after not being able to get line vty 0 4 to work...
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