UDP
ICMP
GRE
DSCP Marking: Differentiated Services Code Point (DSCP), it is the first 6 bits in the ToS byte. DSCP
Marking allows users to classify traffic based on DSCP value and send packets to next Router.
Note: To be sure the router(s) in the backbones network have the capability in executing and checking the
DSCP through-out the QoS network.
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