Cisco
400-007 · Question #9
400-007 Question #9: Real Exam Question with Answer & Explanation
The correct answer is A: Control plane policers are enforced in hardware to protect the software path, but they are. For high availability, control plane policers must be enforced in hardware and applied before forwarding decisions to protect the CPU-based control plane from traffic floods.
Question
Which two control plane policer designs must be considered to achieve high availability? (Choose two.)
Options
- AControl plane policers are enforced in hardware to protect the software path, but they are
- BControl plane policers are really needed only on externally facing devices.
- CControl plane policers can cause the network management systems to create false alarms.
- DControl plane policers must be processed before a forwarding decision is made.
- EControl plane policers require that adequate protocols overhead are factored in to allow protocol
Explanation
For high availability, control plane policers must be enforced in hardware and applied before forwarding decisions to protect the CPU-based control plane from traffic floods.
Common mistakes.
- B. Control plane policers are required on all network devices, not only externally facing ones, because internal misconfigurations or traffic bursts can also overwhelm the control plane.
- C. Properly tuned control plane policers should not generate false alarms in network management systems, so this statement does not represent a valid high-availability design consideration.
- E. While factoring in protocol overhead is a tuning best practice, it is not one of the two primary architectural design principles required for high availability.
Concept tested. Control plane policing design principles for high availability
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