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Last Updated: Jul 30, 2026
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Cisco 642-321 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Maintenance, Troubleshooting & Standards | 25% | - ITU-T G.707, G.783, G.806 compliance - Error rate analysis and diagnostics - Alarm interpretation and fault isolation |
| Topic 2: SDH Fundamentals and Architecture | 25% | - SDH standardization and hierarchy - Frame structure and overhead bytes - Synchronization and timing principles |
| Topic 3: SDH Configuration and Provisioning | 25% | - Protection switching mechanisms - Performance monitoring parameters - Path and trail provisioning |
| Topic 4: SDH Equipment and Interfaces | 25% | - Optical interfaces and line rates - Electrical to optical conversion - Multiplexers, regenerators, cross-connects |
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