Exam 350-501 topic 1 question 18 discussion

I think C is the correct answer in this question. There is is nothing about multivendor config capabilities in multi layer control plane.

There is nothing with "multivendor" and nothing with "layer 0 Wavelenght restoration" I think "B" is the correct anwser!

Answer B: "It automatically provisions, monitors, and manages traffic across Layer 0 to Layer 3." A Multi-Layer control plane can help automate network management tasks across multiple layers of the OSI model, including Layer 0 (physical layer) to Layer 3 (network layer). By automating these tasks, network administrators can reduce the risk of human error and improve network reliability.

WOW, this question is so obscure and for sure is not covered in the Cisco official training material. These links may help make some sense of it, I learned something new: I think the answer is indeed C based on this: https://orhanergun.net/what-is-layer-0-in-the-osi-layers - "If you are working in transport networking, you already know that Layer 0 is the photonics layer, more specifically, DWDM is considered as the Layer 0 of the OSI layers." https://www.acgcc.com/media/reports/files/Cisco-nLight-Economics-Whitepaper_ACG.pdf - "nLight optimizes the network, providing protection via the IP layer and restoration via the optical layer"

This is probably the most debated question and I see why. I checked all the links provided here, and I still come to the conclusion A is the correct answer. If this is in regards to the OSI layer model , there is no such thing as layer 0 , therefore I go with answer A. Please prove me wrong.

All question about WDM/OTN, Cisco formulates them wrong. Multi-layer control plane is the combination for both IP and OTN network management. One could consider all things optical as layer 0, which would exclude answer 'A'. 'B' mentions automatically provisioning which is a big statement but could be considered right. If 'dynamic wavelength restoration' means ability to geographically protect an OTN service then this is right.

The multi-layer aspect refers to the fact end-to-end service may be instantiated via a data plane path which traverses multiple different network elements that belong to different technology layers.

I'd vote for 'C'

i think A is correct: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/whitepaper_c11-718852.html