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Exams300-415Questions#110
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300-415 · Question #110

300-415 Question #110: Real Exam Question with Answer & Explanation

The correct answer is A: policy policer bursty-traffic rate 1000000 burst 20000 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept. To redirect traffic when it exceeds a certain burst threshold, a policer configured with the exceed remark action is used, which marks the exceeding traffic for a subsequent data policy to then redirect it to an alternative interface.

Policies

Question

Refer to the exhibit. The ge0/0 interface connects to a 30-MB link. A network administrator wants to always have 10 MB available for high priority traffic. When lower-priority traffic bursts exceed 20 MB, traffic should be redirected to the second WAN interface ge0/1. Which set of configurations accomplishes this task?

Options

  • Apolicy policer bursty-traffic rate 1000000 burst 20000 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
  • Bpolicy policer bursty-traffic rate 100000 burst 20000 exceed continue access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
  • Cpolicy policer bursty-traffic rate 10000 burst 20000 exceed drop access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
  • Dpolicy policer bursty-traffic rate 10 burst 20 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept

Explanation

To redirect traffic when it exceeds a certain burst threshold, a policer configured with the exceed remark action is used, which marks the exceeding traffic for a subsequent data policy to then redirect it to an alternative interface.

Common mistakes.

  • B. The exceed continue action means that traffic exceeding the policer rate is forwarded without any modification or consequence, thus failing to implement the redirection requirement.
  • C. The exceed drop action would discard traffic that exceeds the policer rate, which does not meet the requirement to redirect the traffic to ge0/1.
  • D. The rate and burst values are extremely low (10 bps and 20 bytes), which would police traffic far below the intended 20 MB threshold for redirection.

Concept tested. QoS policer for traffic redirection

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-sdwan-policies.html#Cisco_Reference.dita_06071ef2-921d-408a-b94f-4ee64797ed8f

Topics

#Traffic Policing#QoS#SD-WAN Policies#Traffic Redirection

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