400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ270

Network Design

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Refer to the exhibit. Following a network audit, a network engineer must optimize the existing network convergence time. The proposed solution must account for link-layer and control-plane failures.

Which solution meets these requirements?

  • A Configure debounce timers
  • B Increase fast hello timers
  • C Implement BFD
  • D Enable LSP fast flood
Explanation

Bidirectional Forwarding Detection (BFD) provides rapid detection of forwarding-path failures for IS-IS, improving convergence beyond normal IS-IS hello-based detection. BFD control-plane-failure support also lets IS-IS distinguish a genuine forwarding failure from a control-plane restart, covering both required failure types.

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