Which QoS component alters a packet to change the way that traffic is treated in the network?

Question

Options

• AMarking
• BClassification
• CShaping
• DPolicing

• A
  89% (50)
• B
  2% (1)
• C
  5% (3)
• D
  4% (2)

Explanation

Marking is the QoS component that physically alters a packet's header fields (such as the DSCP bits in the IP header or the CoS bits in an Ethernet frame) to indicate how the packet should be treated as it traverses the network - making it the only option that actually changes the packet itself.

Classification (B) is wrong because it only identifies and categorizes traffic based on existing criteria (like ACLs or DSCP values) without modifying the packet in any way. Shaping (C) is wrong because it delays excess traffic by buffering packets to conform to a defined rate, but does not alter the packet's contents. Policing (D) is wrong because it drops or re-marks traffic that exceeds a defined rate - while re-marking is a function policing can perform, the primary QoS component specifically dedicated to altering packets is Marking.

Memory Tip: Think of Marking like a postal worker stamping "PRIORITY MAIL" on an envelope - you're changing how it's labeled so everyone downstream knows how to handle it. Classification just reads the label; it doesn't write one.

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