next header – Equivalent to IPv4’s Protocol field.hop limit – Roughly equivalent to IPv4’s Time To Live (TTL) field. Every hop decrements this counter by one, and when that counter hits zero - the “time to live” becomes the time to be discarded.payload length – IPv4’s equivalent is the Total Length field.This also helps with QoS, allowing us to prioritize traffic flows rather than individual packets. flow label – No equivalent in IPv4, this field allows a packet to be labeled as part of a particular flow.The “traffic class” name comes from this field’s ability to allow us to assign levels of importance to a packet via QoS.
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