WEBVTT

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This lab uses two Cisco routers with serial ports and a separate Ethernet path.

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Check the port inventory before configuring the serial link.

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Set both serial interfaces to use PPP and assign addresses on the same subnet.

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Verify that the line is up and both PPP control protocols are open.

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Change the far end to HDLC to reproduce an encapsulation mismatch.

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The PPP session closes and the serial probe fails while Ethernet still works.

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Restore PPP on the far end and verify that the serial connection works again.