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Which method allows for similar failover and failback times within a packet-based network?

A mobile network operator is planning to create a NGN backhaul by migrating the existing backhaul network from a legacy SONET-based transport to a packet-based transport. The NGN backhaul network must achieve similar failover and failback times as the legacy network (50ms).

Which method allows for similar failover and failback times within a packet-based network?
A . BPDU
B . E-OAM
C . UDLD
D . BFD

Answer: D

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