Which two statements describe how including Cisco IPoDWDM proactive protection in an optical design would minimize packet loss in the event of a fiber cut? (Choose two).

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A. It uses the FEC field on the OTN frame to trigger protection. IPoDWDM proactive protection monitors the FEC overhead bytes within the OTN frame to detect increasing error rates; when FEC corrections reach a threshold, a protection switch is triggered before the signal degrades to an uncorrectable state, preventing traffic loss. B. It uses a "not to exceed" predefined BER threshold to cause traffic redirection. The feature uses a configurable 'not to exceed' BER threshold so that when the pre-FEC BER crosses the defined limit, traffic is redirected to an alternate path while the primary path is still partially functional, avoiding a hard outage.

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C. It reroutes the optical circuit after an event that impacts service. Rerouting after a service-impacting event describes reactive protection, not proactive protection - the defining characteristic of IPoDWDM proactive protection is that switching happens before service is lost.

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D. It is effective both when you have redundant and nonredundant Layer 3 MPLS paths. IPoDWDM proactive protection requires a redundant optical path to redirect traffic to; without a redundant path there is nowhere to switch to, making it ineffective in nonredundant designs.

Which two statements describe how including Cisco IPoDWDM proactive protection in an optical design would minimize packet loss in the event of a fiber cut? (Choose two).

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