Valid 642-321 real exam questions from Pass4cram.
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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| Section | Objectives |
|---|---|
| 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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