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352-001 · Question #414
352-001 Question #414: Real Exam Question with Answer & Explanation
The correct answer is B: E-OAM. Ethernet OAM (E-OAM) provides the fault detection and protection switching mechanisms needed to achieve 50 ms failover and failback times in packet-based NGN transport networks.
Question
A mobile network operator is designing an NGN backhaul and plans to migrate their legacy SDH and SONET-based transport network to a packet-based transport network. The NGN network must achieve similar failover and failback times as the legacy network (50 milliseconds). Which method does allow for similar failover and failback times on the new packet-based network?
Options
- ABFD
- BE-OAM
- CUDLC
- DBPDU
Explanation
Ethernet OAM (E-OAM) provides the fault detection and protection switching mechanisms needed to achieve 50 ms failover and failback times in packet-based NGN transport networks.
Common mistakes.
- A. BFD (Bidirectional Forwarding Detection) is a fast failure detection protocol that notifies routing protocols of link failures but does not itself implement the transport-level protection switching mechanism required to guarantee 50 ms failover.
- C. UDLC (Unidirectional Link Detection Control) is not a recognized standard for fast protection switching or failover in NGN packet transport networks.
- D. BPDU (Bridge Protocol Data Unit) is a Spanning Tree Protocol message used for loop prevention in Layer 2 networks and does not provide fast transport-level protection switching comparable to SDH or SONET.
Concept tested. Ethernet OAM for 50 ms packet transport failover
Reference. https://www.itu.int/rec/T-REC-Y.1731/en
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