QoS = Quality of Service. This is a general term of classifying / prioritizing traffic in the network (for example, prioritize VoIP over FTP traffic)

ToS = Type of Service. This is a byte in the IPv4 header which is used for Precedence, or in other words categorizing traffic classes (eg. precedence 0 = routine traffic, 5 = critical). In the more modern form, the ToS is used for DSCP. This is one of the tools available for QoS implementation.

CoS = Class of Service. This is a field in the ethernet header, also for categorizing traffic (0-7), however this works at layer 2


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