Question: If the network layer is sending a message from A to D via B , it can be sure that a message sent by the

If the network layer is sending a message from A to D via B, it can be sure that a message sent by the Data Link layer from A to B always correctly gets to B, and a message sent from B to D always correctly gets to D. How then is it possible for the Network layer to be unable to correctly deliver a message from A to D?

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