What cable connects routers to communicate ? I am using Packet Tracer Simulator, and I connected 2 routers using a DTE connector. After doing this, I am unable to ping between the 2 routers. Is using a DTE cable the best for connecting routers?

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You must be using a serial connection. A serial connection needs the host on one end to be a DTE (Data Terminal Equipment), and the host on the other end to be a DCE (Data Communications Equipment). A DTE talks to a DCE. The router configured as DCE is the one where you set the clock rate and other interface parameters.

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