Three versions exist because three kinds of learners exist. Paper studiers, simulation lovers, browser practitioners — the Real4Prep 642-991 package serves each with identical 75 practice questions.
Cisco 642-991 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Cisco Data Center Unified Fabric Solutions Design (DCUFD) |
| Exam Number: | 642-991 |
| Exam Format: | Drag and Drop, Scenario-based, Multiple Choice Single Answer, Multiple Choice Multiple Answer |
| Passing Score: | 750 (scale 100-900) |
| Related Certifications: | Cisco Unified Fabric Design Specialist CCNP Data Center |
| Available Languages: | Japanese, English |
| Real Exam Qty: | 65-75 |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 250–300 |
| Recommended Training: | Designing Cisco Data Center Unified Fabric (DCUFD) v5.0 |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: |  |
| Exam Way: | Onsite at Pearson VUE authorized testing centers; closed-book |
| Pre Condition: | Recommended: CCNA Data Center or equivalent knowledge; no strict mandatory prerequisite |
| Official Syllabus URL: | https://www.cisco.com |
Cisco 642-991 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Storage Networking Design | 12% | - Storage integration in unified fabric - FCoE, Fibre Channel, and iSCSI - SAN architecture and redundancy |
| Topic 2: Aggregation Layer Design | 20% | - FabricPath and OTV design - VLAN, VRF, and virtualization - Aggregation layer features |
| Topic 3: Security and Management Design | 14% | - Monitoring, management, and automation - Data center security framework - Access control and segmentation |
| Topic 4: Access Layer Design | 15% | - Unified fabric connectivity - Top-of-Rack and End-of-Row models - Server and storage access design |
| Topic 5: Core Layer Design | 18% | - Core layer characteristics and functions - Multicast and traffic engineering - Routing protocols and design |
| Topic 6: Data Center Architecture and Modularity | 15% | - Modular design principles - Data center layered architecture - Scalability and high availability models |
| Topic 7: Design Methodology | 6% | - Data center design requirements - Characterizing existing infrastructure - Business trends and requirements |
Cisco Data Center Unified Fabric Solutions Design (DCUFD) Exam: Three Versions, One Standard
Recommended: CCNA Data Center or equivalent knowledge; no strict mandatory prerequisite Since requirements change over time, confirm the latest on the official Cisco exam page before scheduling.
Three versions of the same study materials: a printable, expert-prepared PDF with free demo download and instant access; a Desktop Test Engine for Windows with customizable simulation and timed modes that works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. All 75 practice questions are identical across versions. Every purchase includes 365 days of free updates, a 50% renewal discount afterward, and unlimited computer installations.
The 642-991 exam is a Cisco certification exam validating the Cisco Data Center Unified Fabric Solutions Design (DCUFD) syllabus shown above. It belongs to these credential paths: CCNP Data Center, Cisco Unified Fabric Design Specialist. Candidates in 2026 start with Real4Prep's 75 practice questions, available as a printable PDF, a Windows Desktop Test Engine, and an Online Test Engine — three versions of the same materials.
Cisco recommends these training resources for the Cisco Data Center Unified Fabric Solutions Design (DCUFD) exam:
Follow the training with steady self-testing — the 75 practice questions from Real4Prep help you apply theory and fill any gaps the training leaves.
The official Cisco Data Center Unified Fabric Solutions Design (DCUFD) outline defines 7 domains. The leading three are Design Methodology (6%), Security and Management Design (14%), and Core Layer Design (18%). The full list is in the topics section above, and Real4Prep's 75 practice questions cover each one.
The Cisco Data Center Unified Fabric Solutions Design (DCUFD) exam contains 65-75 to complete within 90 minutes. Timed simulation in the Real4Prep Desktop Test Engine teaches that rhythm before exam day does.
The Cisco Data Center Unified Fabric Solutions Design (DCUFD) exam requires 750 (scale 100-900) to pass, and registration costs USD 250–300. A failed attempt means paying the same fee again — a readiness check with the Real4Prep engines before booking is the cheaper option.
Real4Prep issues a full refund if you take the Cisco Data Center Unified Fabric Solutions Design (DCUFD) exam within 60 days of purchase and do not pass. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Alternatively, exchange for two free exam products of equal value and keep your original update service. Orders arrive by email within 1 minute — contact support if nothing arrives within 2 hours.
Onsite at Pearson VUE authorized testing centers; closed-book Register for the Cisco Data Center Unified Fabric Solutions Design (DCUFD) exam through these official channels:
After booking, Real4Prep delivers your practice questions within 1 minute — preparation starts the same day.
