Cisco 642-321 : Cisco Optical SDH Exam (SDH)

Pass 642-321 Exam Cram

Exam Code: 642-321

Exam Name: Cisco Optical SDH Exam (SDH)

Updated: Sep 14, 2026

Q & A: 59 Questions and Answers

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Cisco 642-321 Exam Syllabus Topics:
SectionObjectives
Cisco Optical Networking Devices- Configuration and management basics
- Cisco ONS platform overview
Multiplexing and Transport- Bandwidth and payload mapping
- Multiplexing techniques (STM-N, VC, TU structures)
Troubleshooting and Maintenance- Performance monitoring and alarms
- Fault detection and isolation
Protection and Restoration- Failure recovery strategies
- Ring protection mechanisms (MSP, SNCP)
SDH / SONET Fundamentals- Basic SDH architecture and hierarchy
- SONET vs SDH comparison
- Frame structure and transmission principles
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