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200-301 · Question #1050
200-301 Question #1050: Real Exam Question with Answer & Explanation
The correct answer is D: marking. Marking is a QoS mechanism that alters specific values in a packet header to define the packet's class of service, enabling downstream devices to apply appropriate handling.
Submitted by olafpl· Mar 5, 2026IP Services
Question
Which QoS forwarding per-hop behavior changes a specific value in a packet header to set the class of service for the packet?
Options
- Ashaping
- Bclassification
- Cpolicing
- Dmarking
Explanation
Marking is a QoS mechanism that alters specific values in a packet header to define the packet's class of service, enabling downstream devices to apply appropriate handling.
Common mistakes.
- A. Shaping buffers traffic exceeding a configured rate and releases it in a controlled manner, preventing bursts but not modifying packet headers for CoS.
- B. Classification identifies and categorizes traffic based on various criteria but does not alter the packet header itself.
- C. Policing drops or re-marks traffic that exceeds a configured rate, enforcing limits but not primarily setting a class of service via header modification.
Concept tested. QoS marking
Reference. https://www.cisco.com/c/en/us/td/docs/ios/qos/configuration/guide/qos_c_book/qos_classify_mark.html
Topics
#QoS marking#Class of Service
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