During the implementation of Quality of Service (QoS), which mechanism involves modifying packet headers to indicate priority levels for use by downstream devices?
Marking
Policing
Classification
Queuing
Marking is the QoS mechanism that modifies packet headers to indicate their priority level. It uses fields like the Differentiated Services Code Point (DSCP) or IP precedence to mark packets so that downstream devices can apply appropriate QoS policies. Classification identifies and categorizes traffic without altering the packet headers. Queuing manages how packets are scheduled for transmission but does not modify headers. Policing controls the rate of traffic and can drop or remark packets but is not primarily responsible for indicating priority levels through header modification.
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