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In the
academy lab, all the networks will be connected with serial or Ethernet
cables and the students can see and physically touch all the
equipment.
Unlike the academy lab setup, the serial cables in the real world are
not connected back to back. In a real world situation, one router
could be in New York, while another router could be in Sydney,
Australia. An administrator located in Sydney would have to connect to
the router in New York through the WAN cloud in order to troubleshoot
the New York router.
In the academy lab, devices that make
up the WAN cloud are simulated by the connection between the
back-to-back DTE-DCE cables. 
The connection from one router interface s0/0 to another router
interface s0/1 simulates the whole circuit cloud.
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Interactive Media Activity
Drag and Drop: Academy Lab Equipment Setup
When the student completes this activity, the student should
know the correct order in which to connect all devices and
cables to create the CCNA lab equipment setup.
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Web Links