Cisco 642-991 - Cisco Data Center Unified Fabric Solutions Design (DCUFD)

Cisco 642-991 Actual PDF
  • Exam Code: 642-991
  • Exam Name: Cisco Data Center Unified Fabric Solutions Design (DCUFD)
  • Updated: Sep 22, 2026
  • Q & A: 75 Questions and Answers
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About Cisco 642-991 Exam

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Cisco 642-991 Exam Overview:

Certification Vendor:Cisco
Exam Name:Cisco Data Center Unified Fabric Solutions Design (DCUFD)
Exam Number:642-991
Real Exam Qty:Approximately 55–65
Exam Format:Multiple choice, Simulation / scenario-based questions, Multiple response
Available Languages:English
Related Certifications:Cisco Certified Network Professional Data Center (CCNP Data Center)
Exam Price:USD 300 (may vary by region)
Certificate Validity Period:3 years (certification validity; exam itself is retired)
Exam Duration:90 minutes
Sample Questions:Free Download 642-991 Test PDF
Exam Way:Proctored exam at authorized testing centers or online proctoring (historical Cisco delivery method)
Pre Condition:Recommended knowledge of CCNA/CCNP-level networking and data center fundamentals
Official Syllabus URL:https://www.cisco.com

Cisco 642-991 Exam Syllabus Topics:

SectionObjectives
Topic 1: Data Center Unified Fabric Architecture- Unified fabric design principles
  • 1. Layered data center architecture
    • 2. Scalability and redundancy concepts
      - Cisco data center architecture components
      • 1. Cisco Nexus switching platforms
        • 2. Cisco UCS integration
          Topic 2: Network Services and Operations- Security in unified fabric
          • 1. Access control in data center networks
            • 2. Segmentation and isolation
              - QoS and traffic management
              • 1. Congestion management
                • 2. Data center QoS policies
                  Topic 3: LAN and SAN Convergence- FCoE and storage networking
                  • 1. Fibre Channel over Ethernet (FCoE)
                    • 2. SAN design considerations
                      - Unified fabric transport
                      • 1. Lossless Ethernet concepts
                        • 2. Data center bridging (DCB)
                          Topic 4: Virtualization and Compute Integration- UCS integration with fabric
                          • 1. Service profiles and policies
                            • 2. Compute networking design
                              - Server virtualization impacts
                              • 1. Network abstraction layers
                                • 2. VM mobility considerations
                                  Topic 5: Switching and Fabric Technologies- FabricPath and TRILL concepts
                                  • 1. Scalable Layer 2 fabrics
                                    • 2. Loop-free multipathing
                                      - Layer 2 and Layer 3 design
                                      • 1. vPC (virtual Port Channel)
                                        • 2. STP alternatives and optimization

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                                          The Cisco Data Center Unified Fabric Solutions Design (DCUFD) blueprint covers these principal domains:

                                          • Switching and Fabric Technologies
                                          • Network Services and Operations
                                          • Virtualization and Compute Integration

                                          The remaining domains appear in the full official outline, all of which our bank addresses.

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                                          Cisco lists the following prerequisites for the Cisco Data Center Unified Fabric Solutions Design (DCUFD): Recommended knowledge of CCNA/CCNP-level networking and data center fundamentals.

                                          Confirm the details on the official certification page before you book.

                                          Per current exam information, the 642-991 exam includes Approximately 55–65 questions and allows 90 minutes minutes. Timed practice beforehand makes the format feel routine on the day.

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