In DiffServ mode, before the application program sends packets, it needs to confirm that the network has reserved resources for packet transmission.

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Quizplus · Accepted Answer

DiffServ (Differentiated Services) does not require resource reservation before sending packets. It uses a class-based approach to provide different levels of service by marking packets for priority handling, without the need for explicit resource reservation.

In DiffServ Mode, Before the Application Program Sends Packets, It