Learn with Cisco : 642-311 training material for 100% pass
Updated: Sep 12, 2026
No. of Questions: 59 Questions & Answers with Testing Engine
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Cisco 642-311 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Cisco Optical SONET Exam (SONET) |
| Exam Number: | 642-311 |
| Exam Price: | Approx. $150-$200 USD |
| Exam Format: | Multiple Choice Single Answer, Multiple Choice Multiple Answer |
| Real Exam Qty: | 59-64 |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Passing Score: | Not publicly disclosed |
| Related Certifications: | Cisco Optical Certification Track |
| Recommended Training: | Cisco Optical Technology Fundamentals |
| Exam Registration: | Pearson VUE (Historical) Cisco Retired Exams List |
| Sample Questions: | Cisco 642-311 Sample Questions |
| Exam Way: | Computer-based proctored exam at Pearson VUE centers; RETIRED (no longer available for registration) |
| Pre Condition: | No formal prerequisites; recommended knowledge of optical networking and Cisco ONS products |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/retired-exams.html |
Cisco 642-311 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Optical Transport Technologies | 25% | - Multiplexing and demultiplexing - Optical amplifiers and regeneration - Optical transmission principles |
| Topic 2: Cisco ONS Platforms | 25% | - Hardware components and cards - ONS 15454 system overview - Software and management interfaces |
| Topic 3: SONET Fundamentals | 20% | - SONET architecture and hierarchy - Signal levels: OC-1, OC-3, OC-12, OC-48, OC-192 - Frame structure and overhead bytes |
| Topic 4: Maintenance & Troubleshooting | 10% | - Common failure scenarios and recovery - Fault isolation and troubleshooting procedures |
| Topic 5: Provisioning & Configuration | 20% | - Performance monitoring and alarms - Circuit provisioning and protection schemes - Network synchronization and timing |
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