200-301 Question #1380: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which per-hop QoS behavior is R1 applying to incoming packets?

Options

• Amarking
• Bshaping
• Cqueuing
• Dpolicing

Explanation

Queuing is a per-hop QoS behavior where incoming packets are buffered and scheduled for transmission based on specific algorithms, managing congestion on an interface.

Common mistakes.

• A. Marking is the act of classifying packets by adding a QoS tag (e.g., CoS, DSCP) to them, which typically occurs earlier in the QoS process and isn't the direct per-hop behavior of handling packets for transmission.
• B. Shaping buffers excess traffic and smooths the output rate to a configured value, typically applied to outgoing traffic over a period, rather than the immediate per-hop handling of incoming packets.
• D. Policing enforces a maximum rate by dropping or re-marking packets that exceed the threshold, which is about enforcing limits rather than the general per-hop behavior of packet scheduling and management.

Concept tested. Per-hop QoS behaviors (queuing)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_congest/configuration/xe-16/qos-congest-xe-16-book/qos-queuing.html

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