350-501 Question #175: Real Exam Question with Answer & Explanation

Question

An engineer needs to implement QOS mechanism on customer's network as some applications going over the internet are slower than others. Which two actions must the engineer perform when implementing traffic shaping on the network in order to accomplish this task? (Choose two)

Options

• AConfigure a queue with sufficient memory to buffer excess packets.
• BConfigure the token values in bytes.
• CImplement packet remarking for excess traffic.
• DImplement a scheduling function to handle delayed packets.
• EConfigure a threshold over which excess packets are discarded.

Explanation

Traffic shaping requires buffering excess packets in a queue and a scheduling mechanism to release them at a controlled rate, ensuring applications receive the desired Quality of Service.

Common mistakes.

• B. While token values are fundamental to policing and shaping mechanisms, they are typically configured as rates (bits per second) rather than explicitly as 'token values in bytes' in the context of setting up shaping policy.
• C. Packet remarking changes the QoS classification of packets, which is a policing action or a marking action, not a direct component of the shaping mechanism itself that controls the output rate.
• E. Discarding excess packets based on a threshold is characteristic of traffic policing, which drops traffic exceeding a rate, whereas shaping buffers and delays it.

Concept tested. Traffic shaping components and implementation

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_congest/configuration/xe-3s/qos-congest-xe-3s-book/qos-congest-policing-shaping.html

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