What 8-bit field exists in IP packet for QoS?

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What 8-bit field exists in IP packet for QoS?

Tos Field
DSCP
IP Precedence
Cos
-ANOTHER OPTION-

Explanation: The IP datagram header contains an 8-bit field called ToS (Type of Service). The field has been part of the IP header since the beginning, but it was rarely used until the recent introduction of Differentiated Services (Diff-Serv).

Note:
+ CoS does not exists in an IP header. It appears in the header of a 802.1Q frame only. CoS is used for QoS on a trunk link.
+ DSCP uses the first 6 bits of the TOS field.

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