Cisco 400-051 Exam

Which statement describes the Cisco best practice recommendation about priority queue bandwidth allocation in relationship to the total link bandwidth when multiple strict priority LLQs are configured on the same router interface?

  • A. Each LLQ should be limited to one-third of the link bandwidth capacity.
  • B. The sum of all LLQs should be limited to two-thirds of the link bandwidth capacity.
  • C. The sum of all LLQs should be limited to one-half of the link bandwidth capacity.
  • D. The sum of all LLQs should be limited to one-third of the link bandwidth capacity.
  • E. Cisco does not recommend more than one strict priority LLQ per interface.
Answer: Option D.
Explanation: 

Cisco Technical Marketing testing has shown a significant decrease in data application response times when Real-Time traffic exceeds one-third of a link’s bandwidth capacity. Cisco IOS Software allows the abstraction (and, thus, configuration) of multiple LLQs. Extensive testing and productionnetwork customer deployments have shown that limiting the sum of all LLQs to 33 percent is a conservative and safe design ratio for merging real-time applications with data applications.

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