1.After configuring the routers on a stub network and ensuring that no ports are administratively shutdown, connectivity is tested with the extended ping command and fails. What could be the cause? (Choose two.) ae<br><br>A. The serial ports have conflicting encapsulations.<br>B. The wrong AS number is specified for the routing protocol<br>C. The IP host section was not configured.<br>D. The wrong routing protocol was configured on both routers.<br>E. The wrong IP address was assigned to a serial interface.<br>F. The static route was not configured