Which data packets to prefer?

The need for the QoS concept arises from the fact that the available bandwidth is not always sufficient to transmit all of the pending data packets reliably and on time. Load peaks can quickly occur when running FTP downloads, exchanging e-mails and using IP telephones over the data line all at the same time. In order to meet the needs for data transmission even in these situations, certain data packets need to be treated preferentially. This of course requires the device to recognize which data packets should be preferred.

There are two ways to signal the need for preferential treatment of data packets in the device:

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