Nokia Advanced Optical Network Design - 4A0-255

Exam Code: 4A0-255
Exam Name: Nokia Advanced Optical Network Design
Updated: Jul 29, 2026
Q & A: 40 Questions and Answers

Nokia 4A0-255 Exam Syllabus Topics:

Topic	Details
Topic 1	Design a CDC-F network with GMPLS enabled Describe the GMPLS (L0, L1 and MRN) control plane
Topic 2	Define NE hardware manually to optimize cost Describe CDC-F 2.0 hardware with Integrated ROADMs (iROADMs)
Topic 3	Describe the concept of trail grooming Design a network accounting for medium to long-term growth
Topic 4	Describe how synchronization can be transported through a WDM network Implement solutions for synchronized applications
Topic 5	Explain the concept of Probabilistic Constellation Shaping (PCS) Explain the advantages of DGE nodes in long-haul designs
Topic 6	Define low Automatic Spontaneous Emission (ASE) OTs segregation Find alternative routes with better OSNR
Topic 7	Describe the advantages of Forward Error Correction (FEC) Configure grooming optimizing the equipment slot allocation
Topic 8	Describe SRG and “failure scope” configuration Design networks with control plane enabled
Topic 9	Analyze nominal and restoration routes in EPT Design networks with control plane enabled
Topic 10	Identify solutions for latency optimization and measurements Analyze traffic in the given double-ring design
Topic 11	How to determine the number of network elements and their location Design a network with no ASE noise OTs segregation
Topic 12	Explain advanced customer requirements (resilience, latency, encryption, synchronization) Describe advanced EPT design options (including CDC, GMPLS, flexible grid, C+L, etc.)

Reference: https://www.nokia.com/networks/training/onc/exams/advanced-optical-network-design/

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