High Quality Content by WIKIPEDIA articles! As related to network technology, CoS is a 3 bit field within an Ethernet frame header when using 802.1p tagging. The field specifies a priority value of between 0 and 7 inclusive that can be used by Quality of Service (QoS) disciplines to differentiate traffic. While CoS operates only on Ethernet at the data link layer, other QoS mechanisms (such as DiffServ) operate at the network layer and higher. Others operate on other physical layer. Although 802.1p tagging must be enabled to communicate priority information from end station to switch or switch to switch, some switches use CoS to internally classify traffic for QoS purposes.

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