352-001 · Question #159
You have been hired by a startup company to provide optical services using MPLS-TP. Which three options describe reasons to use the MPLS-TP standard in your design? (Choose three.)
The correct answer is A. MPLS-TP is a newer packet transport technology that replaces SONET/SDH. B. MPLS-TP includes extensions to native MPLS OAM for fault detection, monitoring, and propagation. D. MPLS-TP uses an IANA assigned label 13 for OAM. MPLS-TP is a connection-oriented packet transport standard replacing SONET/SDH, featuring extended OAM capabilities and using IANA-assigned label 13 (GAL) for in-band OAM identification.
Question
You have been hired by a startup company to provide optical services using MPLS-TP. Which three options describe reasons to use the MPLS-TP standard in your design? (Choose three.)
Options
- AMPLS-TP is a newer packet transport technology that replaces SONET/SDH.
- BMPLS-TP includes extensions to native MPLS OAM for fault detection, monitoring, and propagation.
- CMPLS-TP requires a routing protocol.
- DMPLS-TP uses an IANA assigned label 13 for OAM.
- EMPLS-TP uses Ethernet Y.1731 OAM.
How the community answered
(18 responses)- A78% (14)
- C6% (1)
- E17% (3)
Why each option
MPLS-TP is a connection-oriented packet transport standard replacing SONET/SDH, featuring extended OAM capabilities and using IANA-assigned label 13 (GAL) for in-band OAM identification.
MPLS-TP was specifically designed as a packet-based transport technology to replace legacy circuit-based SONET/SDH networks while preserving carrier-grade reliability and OAM characteristics.
MPLS-TP extends native MPLS with standardized OAM tools for continuity checks, fault detection, performance monitoring, and alarm propagation as defined in ITU-T G.8113, filling gaps that native MPLS OAM lacked.
MPLS-TP is specifically designed to operate without a dynamic routing or signaling control plane - static provisioning is one of its key differentiators from native MPLS, making this statement false.
IANA assigned label value 13 as the Generic Associated Channel Label (GAL), which MPLS-TP uses to identify in-band OAM messages within the data plane, enabling fault monitoring without a separate management channel.
MPLS-TP uses ITU-T G.8113 OAM, not Ethernet Y.1731; Y.1731 is an Ethernet-specific OAM standard and is not part of the MPLS-TP specification.
Concept tested: MPLS-TP transport standard OAM features and GAL label
Source: https://www.rfc-editor.org/rfc/rfc5921
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