Seonglae ChoType of service
Original intention is prioritization.
ENC
involves both IP (IP header ECN bit marking) and TCP (TCP header C,E bit marking
ECN Flag )Type of service
The type of service (ToS) field is the second byte of the IPv4 header. It has had various purposes over the years, and has been defined in different ways by five RFCs.[1]
https://en.wikipedia.org/wiki/Type_of_service#DSCP_and_ECN