352-001 Question #703: Real Exam Question with Answer & Explanation

The correct answer is C: shaping. Traffic shaping must be used to rate-limit outbound traffic to the 150 Mbps CIR, buffering excess packets rather than dropping them to ensure low packet loss at the service provider edge.

Question

An enterprise company is attaching to a new Gigabit Ethernet-based link from the local service provider. This connection must have a 150 Mbps committed information rate. For the design of this new service, which QoS mechanism must be used to ensure low packet loss within the service provider network?

Options

Apolicing
BLLQ
Cshaping
DCBWFQ

Explanation

Traffic shaping must be used to rate-limit outbound traffic to the 150 Mbps CIR, buffering excess packets rather than dropping them to ensure low packet loss at the service provider edge.

Common mistakes.

A. Policing drops or remarkes traffic exceeding the CIR, directly causing packet loss rather than preventing it - the opposite of the stated design goal.
B. LLQ provides strict priority queuing for latency-sensitive traffic such as voice but does not enforce a rate cap that limits the total volume of traffic entering the service provider network.
D. CBWFQ distributes bandwidth among traffic classes within an output queue but does not shape the aggregate traffic rate down to the 150 Mbps CIR before it crosses into the SP.

Concept tested. QoS traffic shaping to match service provider CIR

Reference. https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html

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