QOS, COS & TOS

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

https://www.linkedin.com/pulse/voice-video-switched-network-ii-qos-dany-hallak/
https://learningnetwork.cisco.com/thread/38069
https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/23442-tos-cos.html
http://www.ciscopress.com/articles/article.asp?p=101170&seqNum=2

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