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